You build on failure. You use it as a stepping stone. Close the door on the past. You don't try to forget the mistakes, but you don't dwell on it. You don't let it have any of your energy, or any of your time, or any of your space.
“The Jews don't like Farrakhan, so they call me Hitler. Well, that's a good name. Hitler was a very great man.”
“No one can fail to see that the power of the Church among large numbers in many communities is today diminishing, or has already ceased.”