In Revelation 14:2, 'the voice of great thunder' signifies the Lord speaking through the New Heaven from Divine Love; it also signifies a glorification of the Lord from His celestial kingdom. (Apocalypse Revealed 615, Apocalypse Explained 855)

'Voices,' 'lightnings,' and 'thunders,' as in Revelation 16:18, signify rationalizations, falsifications of truth, and arguments grounded in falsities that stem from evil in the church among people who believe in salvation by faith alone. (Apocalypse Explained 821[4], 1014)

(References: Apocalypse Revealed 710)

38. Verse 18 And to have dominion over the day and the night, and to make a distinction between the light and the darkness; and God saw that it was good.

'The day' is used to mean good, and 'the night' evil. Consequently goods are called 'the works of the day', whereas evils are called 'the works of the night'. 'The light' is used to mean truth, and 'the darkness' falsity, just as the Lord says,

Men preferred darkness rather than light; he who does the truth comes to the light. John 3:19-21.

Verse 19 And there was evening, and there was morning, a fourth day.