Inertia is the first law of history, as it is of physics.

All logic texts are divided into two parts. In the first part, on deductible logic, the fallacies are explained; in the second part, on inductive logic, they are committed.

Lastly, literature and philosophy both allow past idols to be resurrected with a frequency which would be truly distressing to a sober scientist.

The business of the philosopher is well done if he succeeds in raising genuine doubt.

The picture which the philosopher draws of the world is surely not one in which every stroke is necessitated by pure logic.

If religion cannot restrain evil, it cannot claim effective power for good.

Liberalism is an attitude rather than a set of dogmas - an attitude that insists upon questioning all plausible and self-evident propositions, seeking not to reject them but to find out what evidence there is to support them rather than their possible alternatives.