Improved productivity means less human sweat, not more.

If someone betrays you once, it is his fault. If he betrays you twice, it is your fault. Blessed are those who can laugh at themselves, they will never cease to be amused. Obstacles are those frightful things you see when you take your eyes off your goals.

I do not believe a man can ever leave his business. He ought to think of it by day and dream of it by night.

The man who is too set to change is dead already. The funeral is a mere detail.

Anyone who stops learning is old — whether this happens at twenty or at eighty. Anyone who keeps on learning not only remains young but becomes constantly more valuable — regardless of physical capacity.

Many people are busy trying to find better ways of doing things that should not have to be done at all. There is no progress in merely finding a better way to do a useless thing.

The fuel of the future is going to come from fruit like that sumach out by the road, or from apples, weeds, sawdust - almost anything.