“He that communicates his secret to another makes himself that other's slave.”

“Advice is sometimes transmitted more successfully through a joke than grave teaching.”

“Let him that hath no power of patience retire within himself, though even there he will have to put up with himself.”

“A bad manner spoils everything, even reason and justice; a good one supplies everything, gilds a No, sweetens a truth, and adds a touch of beauty to old age itself.”

“Always leave something to wish for otherwise you will be miserable from your very happiness.”

“True friendship multiplies the good in life and divides its evils. Strive to have friends, for life without friends is like life on a desert island... to find one real friend in a lifetime is good ...”

“The truths that matter most to us come always half spoken.”

“The truth." Dumbledore sighed. "It is a beautiful and terrible thing, and should therefore be treated with great caution.”

“The truth is rarely pure and never simple.”

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