Theophylact of Bulgaria
As Peter continued to suggest, “Let us build three tabernacles,” the Lord unexpectedly enveloped Himself in an uncreated shadow and united with the prophets, demonstrating that He is fully divine, equal to the Father. Just as in the Old Testament where the Lord manifested in a cloud and Moses entered it to receive the Law (Ex. 19:9, Ex. 20:20-21), now a cloud surrounds Christ, not one of darkness (for the shadow of the Law and the ignorance it brought have vanished), but a radiant cloud of light. The truth has arrived, and the grace of the Lord has illuminated all, leaving no space in darkness.