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.

Men do not often dare to avow, even to themselves, the slow progress reason has made in their minds; but they are ready to follow it if it is presented to them in a lively and striking manner, and forces them to recognize it.

Enjoy your own life without comparing it with that of another for there will always be others whose lives on the face of it appear better. However just remember and focus on the fact that your life could be much worse and be grateful it isn't. No matter what others or even you may briefly think you are lucky things aren't worse so be grateful.

The truth belongs to those who seek it, not to those who claim to own it.

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

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

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