Thomas Paine said something like “Trying to argue with a person who has lost the use of reason is like administering medicine to a dead man.”
That’s a keeper! Not heard that one before.
Looked it up:
“To argue with a man who has renounced the use and authority of reason, and whose philosophy consists in holding humanity in contempt, is like administering medicine to the dead, or endeavoring to convert an atheist by scripture.”
—Thomas Paine “The American Crisis”
Thanks for putting this quote out there!