“The whole point of getting things done is knowing what to leave undone”
“Besides the noble art of getting things done, there is the noble art of leaving things undone. The wisdom of life consists in the elimination of non-essentials.”
“What you have done to this point cannot be undone. What you do next... It is still unwritten.”
“What's done cannot be undone.”
“I have the most ill-regulated memory. It does those things which it ought not to do and leaves undone the things it ought to have done. But it has not yet gone on strike altogether.”
“What is done can never be undone.”