I heard an interview and part of it was biographical. The interviewer asked about regret and said something along the lines of "your regrets are a reflection of what you value".
This got me to think about my regrets. I have one regret that's bugged me for a while. About 5 years ago, the person in front of me in line at the cafeteria forgot his wallet. He only realized he couldn't pay when he was ready to go. He left in a hurry to get his wallet. I wasn't fast enough to offer to buy his food. It bugged me that day that I didn’t help out and I still think about it.
Taher, remember what you value. This is what you regret years later.