All the great things are simple, and many can be expressed in a single word: freedom, justice, honor, duty, mercy, hope.

Someone told me that each equation I included in the book would halve the sales.

I have no special talent. I am only passionately curious.

The true sign of intelligence is not knowledge but imagination.

Change is the law of life. And those who look only to the past or present are certain to miss the future.

The world is the great gymnasium where we come to make ourselves strong.

Always bear in mind that your own resolution to succeed is more important than any other.

When your desires are strong enough you will appear to possess superhuman powers to achieve.

No man can succeed in a line of endeavor which he does not like.

Cherish your visions and your dreams as they are the children of your soul, the blueprints of your ultimate achievements.