He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.

The crisis of today is the joke of tomorrow.

I don’t think we are going to become extinct. We are very clever and very resourceful.

A goal is not always meant to be reached, it often serves simply as something to aim at.

A man may die, nations may rise and fall, but an idea lives on.

I want to know what passion is. I want to feel something strongly.

I am the captain of my soul.

In essence, if we want to direct our lives, we must take control of our consistent actions. It's not what we do once in a while that shapes our lives, but what we do consistently.

I invented my life by taking for granted that everything I did not like would have an opposite, which I would like.

Every problem has in it the seeds of its own solution. If you don't have any problems, you don't get any seeds.

Whether you think you can, or you think you can't - you're right.

You'll never do a whole lot unless you're brave enough to try.

The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.

A man should look for what is, and not what he thinks should be.

The great art of life is sensation, to feel that we exist, even in pain.

The way I see it, if you want the rainbow, you gotta put up with the rain.

Work gives you meaning and purpose and life is empty without it.

The deeds you do may be the only sermon some persons will hear today.

If you treat an individual as he is, he will remain how he is. But if you treat him as if he were what he ought to be and could be, he will become what he ought to be and could be

Never look back unless you are planning to go that way.

I'll try anything once, twice if I like it, three times to make sure.