"Exalt the Lord our God, and worship at his holy hill; for the Lord our God is holy" (Psalm 99:9)
God always acts like Himself wherever He may be and whatever He may be doing. When God became flesh and dwelt among us He did not cease to act as He had been acting from eternity. "He veiled His deity but He did not void it." The ancient name dimmed down to spare the helpless eyes of mortal men, but as much as was seen was true fire.
Christ restrained His powers but He did not violate His holiness. In whatsoever He did He was holy, harmless, separate from sinners and higher than the highest heaven.
Just as in eternity God acted like Himself and when incarnated in human flesh still continued in all His conduct to be true to His holiness, so does He when He enters the nature of a believing man. This is the method by which He makes the redeemed man holy.
We can only become holy though the holiness of God.
~A. W. Tozer~