"All who attain to the heights in God are moved to climb the steep and winding path that leads from the valley of the shadow of death to the everlasting heights of divine life and nature. As we scale the heights of mount Zion we become what we seek! We shall never enter upon the realization of any reality which is external to ourselves. Knowing is being, and apart from being there is no knowing of the things of God! Only those who can stand upon the glassy sea, are those who walk in the spirit and come off victorious in the conflict with the beast of the flesh and the carnal mind. That means waging war with the foul and degrading desires of the flesh and the deceptive illusions of the old Adamic mind — even the "good" religious mind! When the sea waves toss your little ship to and fro in the storms of life, lift up your eyes to the throne in the midst of which is the Lamb slain from the foundation of the world. Understand that that throne is here now — the power and dominion of the Christ within ourselves is strong and mighty enough to cause us to enter into our full heritage in God! To follow Jesus to the heights of victory; to be privileged to gaze upon that infinite crystal sea, the manifested life, light, love, righteousness, and power of Christ in our very own spirits, is the vision John saw and has shared with us. The reality is far greater than the symbol!"
Much more in the link:
If people would only bother to see the whole context of passages they quote:
Revelation 15:2-3 And I saw something like a sea of glass mingled with fire, and those who have the victory over the beast, over his image and over his mark and over the number of his name, standing on the sea of glass, having harps of God. 3 **They sing the song of Moses, the servant of God, and the song of the Lamb, **:
The Song of Moses == Israel these are decedent's of Jacob AND Song of the Lamb == Israel who receive Jesus!
Most of Revelation is addressed to Israel - the majority of the Bible is addressed to Israel, we Christians have come along later and are grafted in. Hallelujah!
When we first see the sea of glass in Revelation 4:6 it is between the thrones of the Elders and the Throne of God, and the sea of glass is empty. Israel is His special treasure and will occupy a special place they are His special treasure Exodus 19:5
Revelation 4 the Elders are a kings and priests (Revelation 5:9) a royal priesthood. Christians
In Revelation 15 we see the raptured believers of Israel who have received Jesus, and are now in their rightful place, close to God's Throne.