I just deleted a comment from one of the losers who lurk around this blog. I mention this only because the comment itself provides a teachable moment.
This idiot said that I must be kicking myself for missing the rally from my exit point at 725 this morning. This is classic thinking by a loser.
Every professional knows that perfection in trading and market foresight is impossible. To measure one's results against the standard of perfection is worse than stupid - it is deadly. The reason? Since perfection (or anything close to it) is impossible, you will always be unhappy with your results, whether you are making good money or not. Do this for any length of time and you won't be in the business anymore.
So good traders and investors have reasonable expectations for their performance. They understand what is possible and what is not possible. They are determined to be satisfied with achieving the possible. And they leave the quest for the impossible to the losers.