I never dwell on past mistakes… There is too much to plan for the future to waste time complaining. Elsie Mendl was a great friend of mine for many, many years. And I remember the creed by which she lived: Never complain, never explain. Just think of the people you know who are always explaining their mistakes. It merely rubs the whole thing in. You're reminded again of the mistake. And no one believes the explanation anyway.

Love – That's All Cary Grant Ever Thinks About (1964)