Matthew Poole and continuators on Revelation 1:14

14 His head and his hairs were white like wooll, as white as snow ; and his eyes were as a flame of fire .

Whiteness signifies Purity; whiteness of Hair signifies Old Age ordinarily, which commonly is attended with more Prudence, as having most Experience: hence this Appearance of Christ may both denote his Purity, and Wisdom, and that he is the Ancient of Days; See Dan. 7.9, 13, 22. tho there the term of Ancient of Days belongs to God the Father, yet it also agreeth to Christ, who is equal with the Father, as to his Divine Nature.

Such an Appearance is applied to God, Ezek. 1.27. Dan. 10.6. and to Christ, Rev. 19.12. to denote either Christ's Knowledge, Wisdom, and Omniscience; or his Grace in purifying Souls, as Fire doth Metals; or his Wrath and Anger against his Enemies.