“To believe all men honest is folly. To believe none is something worse.”

Source: The Storyteller

The Man With the Blue Guitar (1937)

This I Believe (1952)
Context: I believe that almost all politicians are honest. For every bribed alderman there are hundreds of politicians, low paid or not paid at all, doing their level best without thanks or glory to make our system work. If this were not true, we would never have gotten past the thirteen colonies.

Two Rivers saying
(15 October 1994)

1940s–present, A Mencken Chrestomathy (1949)

Source: Memnoch the Devil

The Ethics of Belief (1877), The Limits Of Inference
Context: p>We may believe what goes beyond our experience, only when it is inferred from that experience by the assumption that what we do not know is like what we know. We may believe the statement of another person, when there is reasonable ground for supposing that he knows the matter of which he speaks, and that he is speaking the truth so far as he knows it.It is wrong in all cases to believe on insufficient evidence; and where it is presumption to doubt and to investigate, there it is worse than presumption to believe.</p

Source: Cryptonomicon