Keep your eyes on the stars, and your feet on the ground.

If you tremble with indignation at every injustice, then you are a comrade of mine.

Many will call me an adventurer - and that I am, only one of a different sort: one of those who risks his skin to prove his platitudes.

I am not a liberator. Liberators do not exist. The people liberate themselves.

Men make their own history, but they do not make it as they please.

If anything is certain, it is that I myself am not a Marxist. [In a letter about the peculiar 'Marxism' which arose in France 1882].

As a rule, men worry more about what they can't see than about what they can.

What we wish, we readily believe, and what we ourselves think, we imagine others think also.

There is nothing impossible to him who will try.

Failure is unimportant. It takes courage to make a fool of yourself.

I remain just one thing, and one thing only -- and that is a clown. It places me on a far higher plane than any politician.

We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet,

Natural science, does not simply describe and explain nature; it is part of the interplay between nature and ourselves.

The only thing we have to fear is fear itself.

The best part about being with a group is that you don't have to do everything alone. You're with your friends.

I am the greatest, I said that even before I knew I was.

If they can make penicillin out of mouldy bread, they can sure make something out of you.

The best part about being alone is that you really don't have to answer to anybody. You do what you want.

You have to expect things of yourself before you can do them.

He alone, who owns the youth, gains the future.

I restore myself when I'm alone.

It's better to be unhappy alone than unhappy with someone - so far.

I love quotations because it is a joy to find thoughts one might have, beautifully expressed with much authority by someone recognized wiser than oneself.

I am at heart a gentleman.