When we are in love we often doubt that which we most believ... - Francois de La Rochefoucauld

"What men have called friendship is only a social arrangement, a mutual adjustment of interests, an interchange of services given and received; it is, in sum, simply a business from which those involved propose to derive a steady profit for their own self-love."

"In friendship as well as love, ignorance very often contributes more to our happiness than knowledge."

"If we are to judge of love by its consequences, it more nearly resembles hatred than friendship."

"No persons are more frequently wrong, than those who will not admit they are wrong."

"It is easier to be wise for others than for ourselves."