Life is a succession of lessons which must be lived to be understood.

It is not how old you are, but how you are old.

Imagination does not become great until human beings, given the courage and the strength, use it to create.

I restore myself when I'm alone.

Consistency is contrary to nature, contrary to life. The only completely consistent people are the dead.

Without a measureless and perpetual uncertainty, the drama of human life would be destroyed.

I've learned that even when I have pains, I don't have to be one.

Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.

In three words I can sum up everything I've learned about life: it goes on.

During your life, never stop dreaming. No one can take away your dreams

Almost all our desires, when examined, contain something too shameful to reveal.

You never know what life is like, until you have lived it.

As far as we can discern, the sole purpose of human existence is to kindle a light of meaning in the darkness of mere being.

Anybody can dig a hole and plant a tree. But make sure it survives. You have to nurture it, you have to water it, you have to keep at it until it becomes rooted so it can take care or itself. There are so many enemies of trees.

The knowledge of oneself will preserve that person from vanity.

The young people think the old people are fools - but the old people know the young people are fools.

My art and profession is to live.

I'm never going to be disabled. I'm sick of being so healthy.

A man who dares to waste one hour of time has not discovered the value of life.

How can I go forward when I don't know which way I'm facing?

When someone leaves, it's because someone else is about to arrive.