Only a life lived for others is a life worthwhile.
Pure mathematics is, in its way, the poetry of logical ideas.
Love is a better teacher than duty.
We shall require a substantially new manner of thinking if mankind is to survive.
I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.
Small is the number of people who see with their eyes and think with their minds.
There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.
It was the experience of mystery - even if mixed with fear - that engendered religion.
We still do not know one thousandth of one percent of what nature has revealed to us.
The man of science is a poor philosopher.
God may be subtle, but he isn't plain mean.
You cannot simultaneously prevent and prepare for war.
I do not believe in the God of theology who rewards good and punishes evil.
Everything should be made as simple as possible, but not simpler.
A man should look for what is, and not for what he thinks should be.
Reality is merely an illusion, albeit a very persistent one.