We have seen His character.

“Our God is lovely (Psalm 90:17). His beauty is undimmed. Nothing can or will change this aspect of His nature. Though we are so often tempted by beautiful things on this earth, we believers have been claimed by a being far more beautiful and lovely than anything in creation. We have not of course seen God in person, but we have seen His character, and read of His splendor, and discovered His excellent Son, and those vistas can lift us from giving in to the temptation to lesser things if we simply raise our vision on a regular basis to behold the beauty of the Lord.”
—Owen Strachan & Doug Sweeney, “The Beauty of God,” Jonathan Edwards On Beauty (The Essential Edwards Collection), pp. 43-44.