“Courteous men learn courtesy from the discourteous.”
“Courteous people learn courtesy from the discourteous”
“Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”
“We learn from experience that men never learn anything from experience.”
“Whatever he learned from me, I learned well from Leonardo that teaching is a matter of drawing out from men what is already in their hearts, and that men learn only what they want to.”
“The nearer persons come to each other, the greater is the room and the more are the occasions for courtesy; but just in proportion to their approach the gentleness of most men diminishes.”