(noun) (now usually in the plural) Sanity. Example: "He's gone completely out of his wits."
"Brevity is the soul of wit."
"Tact: the ability to describe others as they see themselves."
"Words may show a man's wit, actions his meaning."
"Quotation is a serviceable substitute for wit."
"Wit is educated insolence."
"I would challenge you to a battle of wits, but I see you are unarmed!"