Look at the world. There is no pure competitor to the United States of America.

I mean, I do think at a certain point you have made enough money.

Life should be great rather than long.

It is better to lead from behind and to put others in front, especially when you celebrate victory when nice things occur. You take the front line when there is danger. Then people will appreciate your leadership.

The water in a vessel is sparkling; the water in the sea is dark. The small truth has words which are clear; the great truth has great silence.

For the past 33 years, I have looked in the mirror every morning and asked myself: 'If today were the last day of my life, would I want to do what I am about to do today?' And whenever the answer has been 'No' for too many days in a row, I know I need to change something.

The doctor of the future will give no medicine but will instruct his patient in the care of the human frame, in diet, and the causes and prevention of disease.

I am sometimes sad when I hear the personal stories of Tibetan refugees who have been tortured or beaten. Some irritation, some anger comes. But it never lasts long. I always try to think at a deeper level, to find ways to console.

It stands to the everlasting credit of science that by acting on the human mind it has overcome man's insecurity before himself and before nature.

Our life of poverty is as necessary as the work itself. Only in heaven will we see how much we owe to the poor for helping us to love God better because of them.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

If you can, help others; if you can't do that, at least don't harm them.