Under the freest constitution ignorant people are still slaves.

I hope to see the bringing together of all the best educated people of the earth into a worldwide Congress of Scientists.

The penalty of death is the only one that makes an injustice absolutely irreparable; from which it follows that the existence of the death penalty implies that one is exposed to committing an irreparable injustice; from which it follows that it is unjust to establish it. This reasoning appears to us to have the force of a demonstration.

People still retain the errors of their childhood, their nation, and their age, long after they have accepted the truths needed to refute them.

If it is possible to have a linear unit that depends on no other quantity, it would seem natural to prefer it. Moreover, a mensural unit taken from the earth itself offers another advantage, that of being perfectly analogous to all the real measurements that in ordinary usage are also made upon the earth, such as the distance between two places or the area of some tract, for example. It is far more natural in practice to refer geographical distances to a quadrant of a great circle than to the length of a pendulum.

Enjoy your own life without comparing it with that of another.

Under the freest constitution ignorant people are still slaves.