Louis

“It is a wise thing to be polite; consequently, it is a stupid thing to be rude. To make enemies by unnecessary and willful incivility, is just as insane a proceeding as to set your house on fire. For politeness is like a counter--an avowedly false coin, with which it is foolish to be stingy.”
― Arthur Schopenhauer, The Wisdom of Life and Counsels and Maxims

“La plus belle des ruses du diable est de vous persuader qu'il n'existe pas."

("The devil's finest trick is to persuade you that he does not exist.")”
― Charles Baudelaire, Paris Spleen

“The fool doth think he is wise, but the wise man knows himself to be a fool.”
― William Shakespeare, As You Like It

“Never tell the truth to people who are not worthy of it.”
― Mark Twain