That was the good part of being a trial lawyer; I got the completion from the final arguments (and the "feedback" from the jury.)

Same thing with investigations or even writing a screenplay; a completed report or script is a very good feeling (though screenplays are never really finished, especially if you don't market them and they aren't produced.)

'tis strange I should be old and neither wise nor valiant. From "The Maid's Tragedy" by Beaumont & Fletcher