'Facts' are the bounds of human knowledge, set for it, not by it.

The greatest weapon we have to combat stress is the ability to choose our thoughts.

True ideas are those that we can assimilate, validate, corroborate, and verify. False ideas are those that we cannot. That is the practical difference it makes to us to have true ideas; that therefore is the meaning of truth, for it is all that truth is known as.

Positive images of the future are a powerful and magnetic force... They draw us on and energize us, give us courage and will to take on important initiatives. Negative images of the future also have a magnetism. They pull the spirit downward in the path of despair.

Experience, as we know, has a way of boiling over, and making us correct our present formulas.

A man of sense is never discouraged by difficulties; he redoubles his industry and his diligence, he perseveres and infallibly prevails at last.

As long as there are postmen, life will have zest.