Religion is the sum of the expansive impulses of a being.

It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to mathematics, though she is still forbidden to resort to physics or chemistry.

The difference between heresy and prophecy is often one of sequence. Heresy often turns out to have been prophecy -- when properly aged.

For men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt.

The most costly of all follies is to believe passionately in the palpably not true. It is the chief occupation of mankind.

We must respect the other fellow's religion, but only in the same sense and to the extent that we respect his theory that his wife is beautiful and his children smart.