Brightness everywhere! The way a rainbow springs out of the sky on a rainy day - that's what it was like. It turned out to be the glory of God.
The light of the sun is so bright that it can be very dangerous to look at without some protection over your eyes — they could be permanently damaged.
Have you ever wondered what God is like? Quite often the Bible speaks of God as being gloriously bright — so bright that you couldn't really look at him without it having a deep, deep effect upon you. That was what happened to the prophet Ezekiel when he saw this amazing brightness — it was the brightness of the glory of God, and Ezekiel fell flat on his face.
In the New Testament we read that the Lord Jesus Christ was, for a short time, changed into a person so bright that the men who were with him had never seen anything brighter before and had never seen clothes as shining white as those Jesus was wearing. The brightness of the glory of God shone in Christ. Some years later, the apostle Paul was struck down on the road to Damascus by the brightness of God's glory and he was temporarily blinded.
God is glorious. The glorious brightness is telling us that God is absolutely pure in every way. He is so pure that we cannot look at him directly. But we do see him in the person of Jesus Christ — the divine shield by which we can see God and trust God.