Isaiah 6 records the prophet’s vision of God, “I saw the Lord.” Yet Exodus 33:20; John 1:18; and 1 John 4:12 state that no one has ever seen God. One answer holds that God the Father and God the Spirit are invisible, but God the Son is visible. In this line of thinking, Isaiah saw the preincarnate Christ exalted in heaven. Another answer claims that Isaiah merely saw the reflected glory of God and not God in His pure essence, similar to when Moses confronted the burning bush in the wilderness. God was there, the fire was visible from a distance, but God’s identity and person were only represented, not physically apparent.
ISAIAH 6:1– In the year the king Uzziah died I saw also the Lord sitting upon a throne, high and lifted up, and his train filled the temple.