“There's no regret more painful than the regret of things that never were.”

“I don't regret the painful times; I bare my scars as if they were medals.”

“Whoever has three things will never regret:”

“We must all suffer from one of two pains: the pain of discipline or the pain of regret. The difference is discipline weighs ounces while regret weighs tons.”

“But she never looked back with regret. There were so many ways for things to get better.
-Jing-mei”

“Learning is the only thing the mind never exhausts, never fears, and never regrets.”

“It's better to act and to regret / Than to regret not to have acted”

“A tedium that includes only the anticipation of more tedium; the regret, now, of tomorrow regretting having regretted today.”

“You will have more regrets for the things you didn't try than the ones you tried and didn't succeed at.”

“Many times in life I've regretted the things I've said without thinking. But I've never regretted the things I said nearly as much as the words I left unspoken.”