We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology.

Live to the point of tears.

I think it's much more interesting to live not knowing than to have answers which might be wrong.

Dictators ride to and fro upon tigers which they dare not dismount. And the tigers are getting hungry.

Open your eyes, look within. Are you satisfied with the life you're living?

Some days you're the bug, some days you're the windshield.

I’m not afraid of death, but I’m in no hurry to die. I have so much I want to do first.

The desire to fly is an idea handed down to us by our ancestors who... looked enviously on the birds soaring freely through space... on the infinite highway of the air

Don't let making a living prevent you from making a life.

All my life I have tried to pluck a thistle and plant a flower wherever the flower would grow in thought and mind.

There's no advantage to hurrying through life.

Don't be concerned others not appreciating you. Be concerned about your not appreciating others.

Life is an ongoing process of choosing between safety (out of fear and need for defense) and risk (for the sake of progress and growth). Make the growth choice a dozen times a day.

The less you know, the more you believe.

Those who want to live, let them fight, and those who do not want to fight in this world of eternal struggle do not deserve to live.

I think it can be shown that the law makes ten criminals where it restrains one.

I always like to look on the optimistic side of life, but I am realistic enough to know that life is a complex matter.

Old age is by nature rather talkative.

There are two tragedies in life. One is to lose your heart's desire. The other is to gain it.

Don't be too timid and squeamish about your actions. All life is an experiment. The more experiments you make the better.

For life in general, there is but one decree: youth is a blunder, manhood a struggle, old age a regret.