Confucius
A man who has committed a mistake and does not correct it is committing another mistake.
Cullen Hightower
Laughing at our mistakes can lengthen our own life. Laughing at someone else's can shorten it.
James A Froude
Experience teaches slowly and at the cost of mistakes. James A. Froude (1818 - 1894)
Niels Bohr
An expert is a person who has made all the mistakes that can be made in a very narrow field.