The sceptic will say, 'It may well be true that this system of equations is reasonable from a logical standpoint, but this does not prove that it corresponds to nature.' You are right, dear sceptic. Experience alone can decide on truth.

One lives one's life under constant tension, until it's time to go for good

If a man aspires towards a righteous life, his first act of abstinence is from injury to animals.

Strive not to be a success, but rather to be of value.

In a sailboat I become oblivious to everything else in the world.

I regard class differences as contrary to justice and, in the last resort, based on force.

Make everything as simple as possible, but not simpler.