Marry, and you will regret it; don’t marry, you will also regret it; marry or don’t marry, you will regret it either way. Laugh at the world’s foolishness, you will regret it; weep over it, you will regret that too; laugh at the world’s foolishness or weep over it, you will regret both. Believe a woman, you will regret it; believe her not, you will also regret it… Hang yourself, you will regret it; do not hang yourself, and you will regret that too; hang yourself or don’t hang yourself, you’ll regret it either way; whether you hang yourself or do not hang yourself, you will regret both. This, gentlemen, is the essence of all philosophy. - Søren Kierkegaard
Reading this quote makes one think that whatever we do in our life, we will regret it somehow. It can give you a pessimistic feeling about life.
It depends how you look at it. If you regret smaller decisions, you can still learn from your mistake and try another way.
For bigger decisions, let’s say like mentioned in the quote, deciding to marry someone. It’s probably not easy to go back to the decision point, rewind everything, learn from it and apply it to the next marriage ahead.
Try to take your time for bigger decisions in life using methods like the Weighted Average Decision Matrix