How can sincerity be a condition of friendship? A taste for truth at any cost is a passion which spares nothing.Albert Camus
To practice five things under all circumstances constitutes perfect virtue; these five are gravity, generosity of soul, sincerity, earnestness, and kindness.Confucius
To rule a country of a thousand chariots, there must be reverent attention to business, and sincerity; economy in expenditure, and love for men; and the employment of the people at the proper seasons.Confucius
However greatly we distrust the sincerity of those we converse with, yet still we think they tell more truth to us than to anyone else.Francois de La Rochefoucauld