A decision becomes steadier when the reasons are recorded before the outcome arrives.

Outcomes rewrite memory. Once you know how something turned out, your recollection of why you chose it shifts to fit, so a good result makes you feel wiser than you were and a bad one makes you feel foolish. Neither is a fair reading of the decision as it actually stood. Reasons written down before the answer arrives are the only honest record you get.

Before your next significant choice, note in three lines what you expect and why. Read it afterwards, and judge the thinking separately from the result.