Commentaries:
Robertson's Word Pictures (NT)
As it were a glassy sea (wv qalassa ualinh). Old adjective (from ualov, glass, Revelation 21:18, Revelation 21:21), in N.T. only here and Revelation 15:2. Possibly from uei (it rains), like a raindrop. At any rate here it is the appearance, not the material. Glass was made in Egypt 4,000 years ago. In Exodus 24:10 the elders see under the feet of God in the theophany a paved work of sapphire stone (cf. Ezekiel 1:26). The likeness of the appearance of sky to sea suggests the metaphor here (Beckwith).
Like crystal (omoia krustallw). Associative-instrumental case after omoia. Old word, from kruov (ice and sometimes used for ice), in N.T. only here and Revelation 22:1, not semi-opaque, but clear like rock-crystal.
In the midst of the throne (en mesw tou qronou). As one looks from the front, really before.
Round about the throne (kuklw tou qronou). Merely an adverb in the locative case (Romans 15:19), as a preposition in N.T. only here, Revelation 5:11; Revelation 7:11. This seems to mean that on each of the four sides of the throne was one of the four living creatures either stationary or moving rapidly round (Ezekiel 1:12 f.).
Four living creatures (tessera zwa). Not qhria (beasts), but living creatures. Certainly kin to the zwa of Eze. 1, 2 which are cherubim (Ezekiel 10:2, Ezekiel 10:20), though here the details vary as to faces and wings with a significance of John's own, probably representing creation in contrast with the redeemed (the elders).
Full of eyes (gemonta ofqalmwn). Present active participle of gemw, to be full of, with the genitive, signifying here unlimited intelligence (Beckwith), the ceaseless vigilance of nature (Swete).
Other Robertson's Word Pictures (NT) entries containing Revelation 4:6:
2 Peter 2:12
Revelation 1:13
Revelation 4:1
Revelation 4:8
Revelation 5:6
Revelation 7:11
Revelation 9:7
Revelation 11:15
Revelation 15:2
Revelation 17:3
Revelation 17:12
Revelation 21:11
Revelation 22:1
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