A great source of calamity lies in regret and anticipation; therefore a person is wise who thinks of the present alone, regardless of the past or future. - (Goldsmith, Oliver - Regret)

Footfalls echo in the memory down the passage which we did not take towards the door we never opened into the rose-garden. - (Eliot, T. S. - Regret)

For of all sad words of tongue or pen, the saddest are these: It might have been! - (Whittier, John Greenleaf - Regret)

Go to the effort. Invest the time. Write the letter. Make the apology. Take the trip. Purchase the gift. Do it. The seized opportunity renders joy. The neglected brings regret. - (Lucado, Max L. - Regret)

Hindsight is always twenty-twenty. - (Wilder, Billy - Regret)

I believe that he was really sorry that people would not believe he was sorry that he was not more sorry. - (Butler, Samuel - Regret)

I have many regrets, and I'm sure everyone does. The stupid things you do, you regret if you have any sense, and if you don't regret them, maybe you're stupid. - (Hepburn, Katharine - Regret)

I have no regrets because I know I did my best -- all I could do. - (Ito, Midori - Regret)

I have no regrets, I wouldn't have lived my life the way I did if I was going to worry about what people were going to say. - (Bergman, Ingrid - Regret)

I regret the passing of the studio system. I was very appreciative of it because I had no talent. - (Ball, Lucille - Regret)

If your going to do something tonight that you'll be sorry for in the morning, sleep late. - (Youngman, Henny - Regret)

It's not what your are, it's what you don't become that hurts. - (Levant, Oscar - Regret)

It's the things I might have said that fester. - (Dane, Clemence - Regret)

Let's not burden our remembrance with a heaviness that's gone. - (Shakespeare, William - Regret)

Make it a rule of life never to regret and never to look back. Regret is an appalling waste of energy; you can't build on it; it's only good for wallowing in. - (Mansfield, Katherine - Regret)