Not sending a letter written in anger  Lincoln’s advice to a politician

Lincoln’s secretary of war, Edwin Stanton, had some trouble with a major general who accused him in abusive of .  Stanton complained to Lincoln, who suggested that he write the officer a sharp letter.  Stanton did so, and showed the strongly-worded memorandum to the president, who praised its powerful language. «What are you going to do with it?» asked Lincoln. 
at the , Stanton said, «Why, send it, of course.»
This historical anecdote continues…

«You don’t want to send that letter,» said the President.  «Put it, in the stove. That’s what I do when I have written a letter while I am angry. It’s a good letter and you had a good time writing it, and now you feel better.  Now, burn it and write another one.»