Every cause produces more than one effect.

Education has for its object the formation of character.

Our lives are universally shortened by our ignorance.

I emphasize the reply that the liberty which a citizen enjoys is to be measured, not by the nature of the governmental machinery he lives under, whether representative or other, but by the relative paucity of the restraints it imposes on him.

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

In science the important thing is to modify and change one's ideas as science advances.

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