Once in a while it's good to let the mysteries of the faith shock us a little.
Last night I happened to read something about the Incarnation in St. Thomas, where he speaks about whether it was fitting for God to become man.
One short sentence suddenly jumped off the page and left me shocked:
"It was fitting that God, by reason of his infinite goodness, should unite it [human flesh] to himself for man's salvation."
Yes, in Jesus Christ, God united human flesh to himself. This is something we're taught as Catholics from our childhood. And it's easy to get used to it and forget how astounding it truly is.
All I could do was go to chapel and sit there for a while, just letting it sink in. And then pray.