This was the appearance of the likeness of the glory of the Lord. When I saw it, I fell facedown

Ezekiel 1:15-28

As I looked at the living creatures, I saw a wheel on the ground beside each creature with its four faces. This was the appearance and structure of the wheels: They sparkled like topaz, and all four looked alike. Each appeared to be made like a wheel intersecting a wheel. As they moved, they would go in any one of the four directions the creatures faced; the wheels did not change direction as the creatures went. Their rims were high and awesome, and all four rims were full of eyes all around.

Wherever the spirit would go, they would go, and the wheels would rise along with them, because the spirit of the living creatures was in the wheels.

Spread out above the heads of the living creatures was what looked something like a vault, sparkling like crystal, and awesome. Under the vault their wings were stretched out one toward the other, and each had two wings covering its body. When the creatures moved, I heard the sound of their wings, like the roar of rushing waters, like the voice of the Almighty, like the tumult of an army. When they stood still, they lowered their wings.

Like the appearance of a rainbow in the clouds on a rainy day, so was the radiance around him.

This was the appearance of the likeness of the glory of the Lord. When I saw it, I fell facedown, and I heard the voice of one speaking.

Why?

The Lord has the appearance of man, so the Lord appears before Ezekiel to talk to him. 

The Glory of the Lord is hard to explain in human language.

The Lord shown before Ezekiel has the mission to this priest even though he was exiled to Babylon.

How?

God is glorious beyond our imagination, God's love is over anyone in our world. It is the Lord who comes to show himself to us.