Andrew of Caesarea
The opened heaven signifies the coming of Christ, which follows from heaven. It is like earthly kings, before whom the lifting of curtains precedes the sentence and condemnation of the guilty. The white horse indicates the brightness of the saints. Seated upon them, He will judge the nations, sending forth a fiery flame from His fiery-flaming eyes. That is, by His all-seeing power He illumines the righteous without burning them, and consumes sinners. The many crowns indicate either His authority over all things earthly and heavenly, however many ranks of angels there are in heaven and assemblies and thrones of saints on earth.
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Or they indicate His victory over sinners, through the longsuffering of His divine economy, according to David's word: "That Thou mayest prevail when Thou art judged" (Ps 50:6). The unknownness of the name signifies the incomprehensibility of His essence. For He has many names according to the divine economy of our salvation: Good, Shepherd, Light, Sun, Life, Righteousness, Redemption, Sanctification. He also has negative names, which deny defects and limitations proper to finite created being: Incorruptible, Immortal, Unchangeable, Invisible. But according to His essence He has no name, since He is incomprehensible and known only to Himself, with the Father and the All-Holy Spirit.