Dennis Hopper said it in the movie Apocalypse Now - "In the middle of the word LIFE is the word IF." Guess you can use that thinking several ways - reflecting backwards ("If only I had done ...") or, better still, forwards ("If I had the power to change the world for the better, I would ...") and then act upon it. Here's another one - "If I wore this great t-shirt, I would ..." And you can. You certainly can.