To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.

It does not matter how slowly you go as long as you do not stop.

Only the wisest and stupidest of men never change.

The man who moves a mountain begins by carrying away small stones.

Everything has beauty, but not everyone sees it.

To See What Is Right And Not Do It Is A Lack Of Courage.

What you do not want done to yourself do not do to others.

Choose a job that you like, and you will never have to work a day in your life.

An orchid in a deep forest sends out its fragrance even if no one is around to appreciate it.

A great man is hard on himself; a small man is hard on others.

The man who asks a question is a fool for a minute, the man who does not ask is a fool for life.

A genius in the wrong position could look like a fool.

Calm, open debate, and logical thought drive strength to its maximum effectiveness.

A society can never be free without women’s liberation

There are ecosystems like coral reefs [at risk] through ocean acidification. Those are valuable things that we should protect.

Democratic openings that come about in that way - the overthrow of a totalitarian government by external powers - it makes it really hard to make those first steps toward democracy.

Impossibility is more possible than everything which we hold to be possible.

I'm what is known as gradually disintegrating. I don't fear the next world, or anything. I don't fear hell, and I don't look forward to heaven.

I was a co-operator too in the sense that I non-co-operated for co-operation, and even then I said that if I could carry the country forward by co-operation I should co-operate.

You may have a cat in the room with you without anxiety about anything except eatables. The presence of a cat is positively soothing to a student.

Why are we ignoring the oceans? Why does NASA spend in one year what NOAA will spend in 1600 years? Why are we looking up? Why are we afraid of the ocean?