Ask yourself whether you are happy and you cease to be so. The only chance is to treat not happiness, but some end external to it, as the purpose of life.

All desirable things... are desirable either for the pleasure inherent in themselves, or as a means to the promotion of pleasure and the prevention of pain.

Next to selfishness the principal cause which makes life unsatisfactory is want of mental cultivation.

Complete liberty of contradicting and disproving our opinion, is the very condition which justifies us in assuming its truth for purposes of action.

The successful conduct of an industrial enterprise requires two quite distinct qualifications: fidelity and zeal.

We have a right, also, in various ways, to act upon our unfavorable opinion of anyone, not to the oppression of his individuality, but in the exercise of ours.

Miracles have no claim whatever to the character of historical facts and are wholly invalid as evidence of any revelation.