"And I saw as it were a SEA OF GLASS mingled with fire: and them that had GOTTEN THE VICTORY over the beast, and over his image ... stand on the sea of glass, having the harps of God. And they sing the song of Moses the servant of God, and the song of the Lamb” (Rev. 15:2-3). GOTTEN THE VICTORY OVER THE BEAST - that is, those who through grace and by the inworkings of HIS LIFE were delivered from the delusions and domains of the bestial system to worship the Father in spirit and in truth. These stand upon the “sea of glass, having the harps of God.” The allusion here is to the Israelites of old who, after having passed through the red sea dry shod, thus securing perfect and blessed deliverance from the bestial system of Egypt, stood upon the shore singing the song of Moses, Miriam and the women playing their timbrels, while their enemies with their chariots and their chosen captains perished in the waters (Ex. 15). The song now sung, however, is not that of Moses only; it is also THE SONG OF THE LAMB. Who might this company be? What might be the sea upon whose shore they sing the song of triumph and praise to their Lord and Deliverer? Methinks I have stood upon that very shore. As surely as the raging sea bespeaks multitudes of surging, clamoring, sinning humanity, so does the exquisite sea of glass represent an assembled throng of transformed saints IN WHOSE HEARTS THE SPIRIT OF THE LAMB RULES. This great sea of the Sons of God is calm and serene, tranquil and quiet - the bestial spirit and nature have been dealt with and these abide in the peace and joy and righteousness and power of the Kingdom of God. Ah! I have stood upon that shore, yea, and do stand with an innumerable company of men and women whose faces are set and whose hearts are fixed to do only and completely the will of the Father. These are they who live and walk in the Spirit, they are the firstborn-destined who are being delivered from the beast and his image. The glassy sea is here MINGLED WITH FIRE - the fiery trials and processings by which He purifies His people, sharpening their vision, whetting the appetite for things eternal, slackening the desire for all that is earthly and all that pertains to this present evil world.
Much more in the link:
https://www.kingdombiblestudies.org/antichrist/antichrist1.htm#9
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"When the book of Revelation was written, John was IN THE SPIRIT. This is a fact of extreme importance. The realm of the Spirit is a realm beyond the reach of the natural. Spiritual things are all about us to such an extent that we live and move and have our being in them, yet the natural man can never see them until the Spirit draws aside the dusky curtains of our carnality and opens our eyes to the things of the spiritual world. Thus it was with John, in exile on barren Patmos, a place of few inhabitants and always swarming with pirates, but the record says of him, “Who bare record of the word of God, and of the testimony of Jesus Christ, and of all things that he saw...for the testimony of Jesus IS THE SPIRIT OF PROPHECY” (Rev. 1:2; 19:10). Preachers and teachers ought to heed this wise counsel and concentrate on the TESTIMONY OF JESUS which is the spirit of prophecy rather than futuristic forecasts of earthquakes, plane crashes, riots, nuclear disasters, political coups, invasions, wars, foreign policies, world government, etc. etc. When God gave us the Holy Spirit, it was not to take soundings of uncharted depths into the future of Russia, America, Europe, or the Jews but to develop a SPIRITUAL CHARACTER, to put on the mind of Christ, and follow the Lamb wheresoever HE goes."
https://www.kingdombiblestudies.org/antichrist/antichrist1.htm#10
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"The ministers of God were not meant to be soothsayers but truth-sayers. We were not called to predict all the changing events in the kingdoms of this world, nor to herald a future antichrist, but to proclaim the ETERNAL PRESENT CHRIST."
"GOTTEN THE VICTORY - victory, conquer, overcome, these all come from the same Greek word. God is producing OVERCOMERS who shall bear HIS MARK"
"GOTTEN THE VICTORY - victory, conquer, overcome, these all come from the same Greek word. God is producing OVERCOMERS who shall bear HIS MARK, and gain the victory over the antichrist beast and his image. SONS OF GOD, it is a present challenge to you, GUARD YOUR GARDEN, there is a beastly system just waiting to stamp its image upon you. You can walk high above it all - because “greater is HE that IN YOU than he that is IN THE WORLD” (I Jn. 4:4). The grace of God be multiplied unto you - and cause you always to triumph to His glory and praise!"