Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.

It is a precarious undertaking to say anything reliable about aims and intentions.

The only real valuable thing is intuition. The intellect has little to do on the road to discovery

When a man, after long years of searching, chances upon a thought which discloses something of the beauty of this mysterious universe, he should not therefore be personally celebrated. He is already sufficiently paid by his experience of seeking and finding.

Generations to come will scarce believe that such a one as this ever in flesh and blood walked upon this earth. (said of Mahatma Gandhi)

There is only one road to human greatness: through the school of hard knocks.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination. Even when the external and scientific requirements for the birth of an idea have long been there, it generally needs an external stimulus to make it actually happen; man has, so to speak, to stumble right up against the thing before the idea comes.