Isaiah 6:3. “And one cried unto another, and said, Holy, holy, holy, is the Lord of hosts: the whole earth is full of His glory.”
We often marvel at the amazing beauty of God’s creation.
Heaven is better than this.
Imagine a choir of seraphim singing in antiphony throughout the heavens, “Holy! Holy! Holy!” That heavenly choir never stops proclaiming the holiness of the Lord of Hosts!
We can’t even imagine such purity, such complete sanctity, because our minds are clouded with our own stuff; our own position, what others think of us, how others react to us.
Nothing like that was going on in Isaiah’s vision. God is so completely without human weakness that He never questions what the seraphim are proclaiming to one another.
He IS three times holy. He is God.