Reply #2: Here the Explanation

[earthside]

Here's the authoritative explanation of the Trinity from the movie "Nuns on the Run".

Charlie McManus: You've got the Father, the Son and the holy ghost. But the three are one - like a shamrock, my old priest used to say. "Three leaves, but one leaf." Now, the father sent down the son, who was love, and then when he went away, he sent down the holy spirit, who came down in the form of a...

Brian Hope: You told me already - a ghost.

Charlie McManus: No, a dove.

Brian Hope: The dove was a ghost?

Charlie McManus: No, the ghost was a dove.

Brian Hope: Let me try and summarize this: God is his son. And his son is God. But his son moonlights as a holy ghost, a holy spirit, and a dove. And they all send each other, even though they're all one and the same thing.

Charlie McManus: You've got it. You really could be a nun!