Energy may be likened to the bending of a crossbow; decision,to the releasing of a trigger.

There is nothing more uncommon than common sense.

Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.

If we know exactly where we're going, exactly how to get there, and exactly what we'll see along the way, we won't learn anything.

He who conquers others is strong; he who conquers himself is mighty.

But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.

Simplicity is the ultimate sophistication.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

Nothing is as easy as it looks.

What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.

The greatest pride, or the greatest despondency, is the greatest ignorance of one's self.

He that cannot reason is a fool. He that will not is a bigot. He that dare not is a slave.

You are not a drop in the ocean. You are the entire ocean, in a drop.

Better beggar woman and single than Queen and married.

All great achievements require time.

I am a lover of truth, a worshipper of freedom, a celebrant at the altar of language and purity and tolerance.

Bitterness is like cancer. It eats upon the host. But anger is like fire. It burns it all clean.

Every intelligent individual wants to know what makes him tick, and yet is at once fascinated and frustrated by the fact that oneself is the most difficult of all things to know.

If we do not lay out ourselves in the service of mankind whom should we serve?

Each problem that I solved became a rule which served afterwards to solve other problems.

We thought that we had the answers, it was the questions we had wrong.