I take it that the good of mankind means the attainment, by every man, of all the happiness which he can enjoy without diminishing the happiness of his fellow men

If there is anything in the world which I do firmly believe in, it is the universal validity of the law of causation.

Only one absolute certainty is possible to man, namely that at any given moment the feeling which he has exists.

Science is organized common sense where many a beautiful theory was killed by an ugly fact.

Skepticism is the highest duty and blind faith the one unpardonable sin.

That which lies before the human race is a constant struggle to maintain and improve, in opposition to State of Nature, the State of Art of an organized polity; in which, and by which, man may develop a worthy civilization

The quarrels of theologians and philosophers have not been about religion, but about philosophy; and philosophers not unfrequently seem to entertain the same feeling toward theologians that sportsmen cherish toward poachers.