Rev 3:7 "And to the angel of the church in Philadelphia write: He who is holy, who is true, who has the key of David, who opens and no one will shut, and who shuts and no one opens, says this:
The “key of David” - This mention of the “key of David” is more cryptic, however, as normative with the imagery and symbols of Revelation, when its OT and/or NT background & context is taken into full and proper consideration, we can arrive at the reason for its allusional prophetic use/mention.
key ‘on the shoulder’ - As made evident from the exposition above, the comparative identification between Isa 22:22 and Isa 9:6 this “key of David”, by being laid ‘upon the shoulders of the recipient, is identified as being a rule/government. SO these were to be charged with leading in a governmental office withing God’s People, and in the days of Israel, this was done in the tribe of Judah (Gen 49:9, 10; cf. 2 Sam 2:1, 4).
And this fulfills the far-reaching prophetic dream that EGW relates in EW 78.3-79.3 (also in e.g. LS 33.1-34.2; 1T 27.1-4), discussed here, which involved the symbolic: “as if slain”, “little lamb” figure.
...your feet - With the “feet” symbolically being ‘the means of going places and/or being established’, and with, as discussed here, and also above in the present post, this Davidic Kingdom will be marshalling towards the Biblical and tangibly necessary establishment of the ‘Temporal Little Lamb Kingdom of God’, and that “in the midst of the seas” (Dan 11:45 = Rev 14:1; 15:2), then those who potentially would then have come out from amongst the ‘tare-filled Church’ which is the assembly of Satan, will also be fully acknowledging and understanding that this Full Gospel ministry and its needed temporal realm establishment, ‘the place of God’s own feet’ (=Isa 60:13b-14; Ezek 43:7) is indeed the Biblical will of God for this Prolonged, ‘due-to-judgement’, Time. (=15MR 292.3-4; cf. this post).
Christ’s statement in Matt 26:40-41 made in relation to His Garden of Gethsemane experience, which His disciples should have also benefitingly “watchfully and prayerfully” participated in is foundational to the similar eschatological “hour of testing” which precedes the sealing and the outpouring of the Latter Rain. (Cf. the Holy Spirit initiated/based and (according to my substantive/exegetical examination/reviewing, much more than less, application-wise) guided exposition of James Tierney in this blog post) And, as discussed in this post, it is through God’s purposeful and fast-tracked, orchestration in allowing Revelation’s Babylon to be established, which today, through Capitalism, is in its fullest, socio-economic phase, and moreover by having allowed His People to be taken captive in it, (indeed just as Jerusalem was under the power of Rome (the burgeoning spiritual “Babylon” then = 1 Pet 5:13)), that this global hour of testing is conducted, when now the existential choice for everyone, both in the secular world and, especially the religious world, is whether they will continue to live according to their selfish, individualistic and ‘fend/look out for yourself (first/only)’, particularly in these days of (actually artificially) limited resources, or if they will instead heed the Full Gospel Mandate of Christ and, actually duty-boundly, variously, even if quasi-self-sacrificially, look out for their brother as their need is. Those who come to pass this “final test” (~5T 81.1[LDE 173, 174] - see about those in the SDA Church who will fail it, starting from the Shaking, here) will then be fully sealed with God’s Full Sabbath Seal and will thus receive the (Real/Full) Latter Rain. (=Rev 18:1-5ff)
So, recapping here, the 144,000 group are “sealed to do God’s Millennial Temple Sanctifying work by being led to understand and have impressed on them (1) God’s True Character (of Love, which jointly mixes Justice and Mercy); (2) The Little Lamb Kingdom’s , New Jerusalem ministry work; and (3) an experience and triumph similar to that of Jesus (see EW 14.1-15.1; 269-273), and thus warranting a similar kingly reward and honor which the human Jesus Himself received. (Phil 2:5-11; Heb 1:3-6). All of these are ‘regnal commendations’ which will be tangibly obtainable and bindingly applicable for those who will establish the NJK Project and, over time, be key in maintaining its founding purposes/objectives, (see in here), with that New Country having a restored Davidic Monarchial Power (cf. here & here) (=Rev 3:12's implicated promise).
See more Biblical details/information on this tri-element seal in this discussion: starting: here, here and here.
So, this overcoming 144,000 group, after they are fully, and thus also ‘intellectually immovably’ (LDE 219.4) sealed (cf. EW 15.1ff) with all of these three key and distinct aspects of God’s seal, become so interwoven in God’s New Jerusalem plans and key in establishing them, is the “bride of Christ” (Rev 19:7-8; 21:9-11ff) and Jesus Himself will cater to them (EW 19.1a) as He thus jointly physically rewards and spiritually readies them for their Sanctuary Service Ministry. Interestingly enough, in EW 16.2 & 18.2 this priestly 144,000 group is said to be given ‘mantles that reach to their feet’, and as this is for their inaugural convening and as they are to serve as both ministering and judging priests, then, based on what was Biblically discovered here, this is manifestly echoing the inauguration/consecration service of priests mentioned in Lev 8 where they symbolically wear both their blue daily service robe and their all-white covering tunic. (=Lev 8:7, 13)
Relatedly, there is no point of “go-ing” anywhere, as now popularly being glibly encouraged in SDA circles, especially amongst the youth (see e.g., here and here), if the actual “vital needs” mission mandate is either: “moronically” not known, indifferently not understood or rebelliously ignored. It is actually not surprising for people who glibly believe that “God’s glory is His Character” to usurptively seek to merely also have this glory while ignoring God’s actual Character. Non-coincidentally, that is exactly the type of usurpation what the Devil had sought to do in Heaven, and, as depicted in the above cited EW 54.2-56.1 vision, he is indeed trying to recreate this deception in all, even/especially, in the SDA Church, who will subscribe to it. And so, in SDA circles, it is perfectly acceptable for them to merely be surfacely “seen” as doing good, rather than actually doing good. And so. e.g., “freely planting trees for the state along a highway” is confused as being humanitarian mission work, and not planting crops to help feed people who will die of hunger! And that is what pointedly underlies the “moronic” action of the 5 virgins who do not end up having a proper infilling of the Holy Spirit. They make their decisions based solely on the surface, cosmetic and “cotton-candy” insubstantive rather than upon deeply-rooted, and exegetically sound truths. And so, case in point, in regards to, e.g., the exegetically unsound, claimed “Isa 6:8-9a” call here, the destruction context of that call to Isaiah is entirely ignored for an instead, fanciful application of that passage. That call to Isaiah was solely being inquired upon by God, i.e., “Who will go for us?” because it was a most unpleasant, judgement/destruction mission (Isa 6:9-13). Nothing short of God’s actual Full Gospel Commission will actually accomplish God’s mandated Full Gospel Commission!! Anything else is not “Mission Work” but merely “Moron Works”.
Succinctly said here, this second Rhodes figure, which I prophetically believe that God guided from his birth in 1853, (perhaps non-coincidentally, in the year in which the first Rhodes, Samuel Rhodes, began to, even if momentarily, quite crucially, veer off course with his detrimental chart-making, -to the point where God Himself had to intervene through the SOP), to be in the position of wealth and power that he came to be in by 1895, where he could make such a pivotal grant to the SDA Church as they then engaged on establishing foreign Missions among non-Christians. As with Cyrus in the Bible, who, as discussed starting here, God also manifestly guided from his birth to the throne of Medo-Persia and in the world hegemony replacement of Babylon some sixty years later (as Cyrus himself came to understand; see Ezra 1:2ff; cf. Josephus, Antiquities 11:1.2 [#5-#7]), he came to be a guided and reserved instrument & asset which God could “summon” at the opportune time to advance His prophetic plans (=Isa 46:11). And so, this manifestly deliberately, long-ago, chosen, guided, enriched and empowered second Rhodes figure (~Isa 45:1-4), came to help chart a new, Biblical course for the SDA Church which served to expand the kingdom of God throughout the world and facilitate their witness to every nation, tongue, tribe and people in the world. And so, as with the still due conquering of Canaan beyond Jericho following the Jordan Crossing (cf. PP 487.1-3ff), was expanded the temporal, territorial standing that God wanted His Church to have in the world.
water was dried up - It may also be seen that with the main physical implements of the Sixth Trumpets army being fire, smoke and brimstone, it can be seen that the wielding of them upon this river can also bring about this drying up effect. Throwing enough brimstones into a river as well as raging fire can cause a physical ‘stopping up’ (=sulphur stone) and ‘evaporating’ (=fire) in “smoke” of the waters of this River. It would take much “ammunition” here to do this to the powerful ‘Great River Euphrates’ but it does not seems that God is about to run out of this “wounding”, plague implements. (Cf. Rev 18:6).
...kings from the east - This is also a cryptic statement in Revelation, but by looking through Biblical precedence, an understanding of its meaning can be arrived at. In history Babylon fell when its waters were dried up by the Medo-Persian King Cyrus and his invading armies (Isa 44:27-45:3; =Battle of Opis) and then it was most easy for them to enter Babylon and overtake it, having timed that attack with a major celebration in Babylon (=Dan 5). It was by earlier having lost a soldier trying to cross this river that this idea of diverting the Euphrates’ intake had be borne with Cyrus; and it also was the arrogance of the Babylonians which resulted in their downfall as, As Greek historian Herodotus says (Histories 1.191) had the suspected that Cyrus was, on top of his siege of Babylon, also working on diverting the river further upstream out of site from the city, they would not have merely remained enclosed in their supposed fully-secure city, but would have gone out to engage the Persian armies surrounding them.
-Thus, the dragon, through pagan/paganized leaders and entities, tried to physically devour the newly born and birth New Covenant/Israel Cause and Church (Rev 12:4b, 15).
-Similarly the more tangibly establish of kingdom of the First Beast (Rev 13:1-10), then assuming a temporal, kingly authority (Rev 13:1), through which it made kingly pronouncements (Rev 13:2's ‘mouth of a lion’) mixed in with blasphemous religious statements (Rev 13:5-6), also attempted to stamp out God’s Gospel Truth which was being upheld by Biblical Christians.
-Then when the power of that First Beast was overcomed by the power of the more Biblical Protestant message, because this Reformation Cause knowingly did not make the full effort to align all of its teachings with the Bible, most notably in regards to the Fourth Commandment, they then effectively became a spokesperson, i.e., a (False) Prophet of first Beast. Through this outright disregard for God’s Sabbath, it never began to delve into its full Biblical meaning and implication, and thus this Second Beast immediately championed the also Sabbath-opposing system of Capitalism, through which it came to form an image to the First Beast. Through its laws echoing this chief Capitalistic thinking, it came to speak like a dragon.
-having a Creator of the Earth and Heavens god (the Geb and Nut married couple =anti-Creation and Sabbath cf. Rev 14:7);
With, as seen in the Biblical account (cf. 1T 292.1) Satan manifestly being the inspirational source of the Ancient Egyptian Religion, it is thus not surprising that many of the claims, themes and teachings made and found in the Bible, and its Great Controversy context, are here substituted and perverted. And that is the religious ideology that Satan now tries to establish with Babylon since its prior unifying and validating Christian ideology has been proven to be actually unBiblical. And so a more “worldly/secular” ideology is sought to be instilled here, as permitted by God. And this is all how Babylon has come to “doubly fall” as pointed stated in a Loud Voice in Rev 18:2. I.e., it is no longer even under a semblance of Christianity, but now under a paganistic/atheistic/secular “spirit”. And these ways are being plausibly advanced as the best way to order the world, thus no longer under the “God wants you to be wealthy and make money at any cost” dogma of Protestant Capitalism, but rather a more humanistic and ecological model which thus makes man and nature the dictating gods of what is good or bad. Indeed anything but what the Creator God has set forth.
Lord vs. His anointed one|Christ - There is here a distinct identity of actually two figures: the Lord and His Anointed One (a.k.a. His Christ). It potentially could be seen, from Rev 11:17 below, that the title “Lord” is referring to “God, the Almighty”, -the one who the 24 elders had worshipped in vs. 16, but as this title “Lord”, especially by itself (i.e., instead of the combined “Lord God” = God the Father) also is patently used to speak of Jesus Christ, then this unique expression “of His Christ” here must straightly, “loadedly”, yet still merely technically (cf. 1 Sam 2:10; 12:3; Psa 27:8, be referring to ‘an anointed one from Jesus Christ (himself)’ (comp. Rev 12:10)
 To hone and relatedly apply here a sermonic quip of David Asscherick, the Church of Christ, His bride, through its history was: formed in Apostolic Times; then de-formed in Church History Apostasy; then, coming out of its ‘“wilderness” refuge’ (Rev 12:14ff; cf. Rev 17:3), and back into “mainline” prominence, was begun to be re-formed by Protestant Reformers; and when through its Remnant (Rev 12:17), it will have been perfected into this New Jerusalem state, it is because it will have been trans-formed from the Church Militant into this Church Triumphant (=Rev 21:9ff), and that, after its Shaking. (=EW 269.1-272.3; LDE 62.1-2)
which more widely implying involves that: just as only the back side of God’s glory could be looked upon, in Jesus this (frontal) Divine glory was most vitally veiled in Humanity; which allowed this “radiance” to be viewed, but on the other hand, Jesus managed to perfectly reproduced to men the ‘establishing substance’ of God in His Righteous Life. So in Jesus the glory of God itself was deliberately not visually revealed in the physical form of Jesus, and His Character was distinctly manifested only in/through the concrete righteous actions/works of Jesus.
Moreover, that achieved commonwealth, would produce a windfall of wealth for individual members. (=Luke 6:38) But because the default and entrenched course of the Church has pervasively, Capitalistically been an individualistic, selfish, competitive, dysfunctional, hateful, strifeful, slothful and “moronic” one, among other base traits, like the evil servant in that Talents parable, they have preferred to bury their talent and resources in a hole, and all through a gross misunderstanding of their master. And so it is today defaultly and solely thought/believed that the Church only needs more money to properly do its work, when in fact it needs to Biblically use and invest the great wealth that God has already given to it.
 See the recent (December 2011) two part sermon series on the Seventh Prophetic Church/Era, Laodicea, by Doug Batchelor (Part 1 and Part 2), although it was quite oddly/perplexingly truncated in specific points. And, as typical with SDA expositions on Laodicea, they’ll generically tell you ‘the SDA Church has (remediable) problems,’ but they’ll shy away from pointing out what these (entrenched) problems (see here) are. (contra Isa 58:1ff; Ezek 33:1-5, 6). How then to begin to “remedy” them?? It’s like a physician telling you that you have a degeneratively-fatal-if-not-treated condition, but not actually telling you exactly what that condition is!! Perhaps they all ‘farsightedly just can’t see those, their, and that (pun intended) capitally abominable, problems’!?? (=Rev 3:17-18; Luke 6:39|Matt 15:14)... or they complacently just don’t want to fix them!! As the pop culture saying goes, in the light of what was expressed in that sermon in regards to ‘wanting to be told if something was wrong’: “You can’t handle the truth!!?”.