For me a simple message, to think and act with courage, independence and imagination.

Only a very dull man spells a word the same way twice.

Even on the most solemn occasions I got away without wearing socks and hid that lack of civilization in high boots

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

The only justifiable purpose of political institutions is to ensure the unhindered development of the individual.

In the matter of physics, the first lessons should contain nothing but what is experimental and interesting to see. A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds.

Education is what remains after one has forgotten what one has learned in school.