Do nothing, and leave nothing undone. ["Doing nothing" is what happens when the doer disappears, it isn't something that one does or chooses not to do.]
One attacks those who possess things that one does not possess. The attack is all the more savage because the one who attacks is destitute and the one who is attacked is well provided. The one who attacks always considers himself to be in the position of legitimate offense.
It is the quietest and meekest people who are often capable of the most sudden and unexpected violences for the reason that when their control does snap, it goes entirely. (Hercule Poirot)