Revelation 4:6

(6) And before the throne there was a sea of glass like unto crystal.—There is a sea before the throne of God. The woman apparelled in purple splendour sits upon many waters (Revelation 17:1). The waters are explained (Revelation 17:15) to be “peoples, and multitudes, and nations, and tongues.” Her throne rests on the fickle and stormy sea of world- opinion, fashion, and passion. The waters represent the unguided, unreasoning, and unprincipled thoughts of men. By analogy, the calm glass-like sea, which is never in storm, but only interfused with flame (Revelation 15:2), represents the counsels of God, those purposes of righteousness and love, often fathomless, but never obscure; always the same, though sometimes glowing with holy anger (Revelation 15:1). (Comp. the Psalmist’s words, “Thy judgments are like the great deep,” Psalms 36:6, Prayer Book version. See also Psalms 77:19, and Romans 11:33-36.) The position of the crystal sea is analogous to that of the molten sea in front of Solomon’s Temple (2 Chronicles 4:9-10).

And in the midst of the throne—i.e., between the seer and the throne. The Apostle saw the crystal sea, and beyond it the living creatures encircling the throne—four living creatures (or, living beings) full of (or, teeming with) eyes before and behind.