“What is done can never be undone.”
“What is done cannot be undone, but one can prevent it happening again.”
“...the heart of a child can take forty-nine blows before it’s damaged for ever and what’s done can never be undone.”
“What's done cannot be undone.”
“The whole point of getting things done is knowing what to leave undone”
“What you have done to this point cannot be undone. What you do next... It is still unwritten.”