La Rochefoucauld

"He who lives without committing any folly is not so wise as he thinks."

"In jealousy there is more self-love than love."

"There are bad people who would be less dangerous if they were quite devoid of goodness."

"No man deserves to be praised for his goodness unless he has the strength of character to be wicked. All other goodness is generally nothing but indolence or impotence of will."