Imagination is more important than knowledge.

If someone feels that he has never made a mistake in his life, it only means that he has never tried anything new in his life.

It is nothing short of a miracle that modern methods of teaching have not yet entirely strangled that sacred spirit of curiosity and inquiry, for this delicate plant needs freedom no less than stimulation.

Go out as far as you can go and start from there

Just as with the man in the fairy tale who turned whatever he touched into gold, with me everything is turned into newspaper clamor.

I think that only daring speculation can lead us further and not accumulation of facts.

If I were not a Jew I would be a Quaker.