Progress is not an accident, not a thing within human control, but a beneficent necessity ... due to the working of a universal law. So surely must the things we call evil and immorality disappear; so surely must man become perfect.

Whatever fosters militarism makes for barbarism; whatever fosters peace makes for civilization.

The idea of disembodied spirits is wholly unsupported by evidence, and I cannot accept it.

Much dearer be the things which come through hard distress.

Marriage: A word which should be pronounced "mirage".

Volumes might be written upon the impiety of the pious.

Hero-worship is strongest where there is least regard for human freedom.