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.
“My sister and I were born in San Francisco. When our parents died, we came down here to live with relatives.”
“No real-world human being brings to the U.S. presidency the range of attributes necessary for full success in the job.”