This Talmudic proverb arose from a case where someone was fined 400 zuzim because he acted in undue haste and insulted some one.
I was once pulling into a parking lot. Since I was a bit late for an important appointment, I was terribly annoyed that the lead car in the procession was creeping at a snail's pace. The driver immediately in front of me was showing his impatience by sounding his horn. In my aggravation, I wanted to join him, but I saw no real purpose in adding to the cacophony.
When the lead driver finally pulled into a parking space, I saw a wheelchair symbol on his rear license plate. He was handicapped and was obviously in need of the nearest parking space. I felt bad that I had harbored such hostile feelings about him, but was gratified that I had not sounded my horn, because then I would really have felt guilty for my lack of consideration.
This incident has helped me to delay my reactions to other frustrating situations until I have more time to evaluate all the circumstances. My motives do not stem from lofty principles, but from my desire to avoid having to feel guilt and remorse for having been foolish or inconsiderate.