Without consciousness and intelligence, the universe would lack meaning.

It is only of life on Earth, however, that one can speak with any certainty. It seems to me that all life on Earth, the sum total of life upon the Earth, has purpose.

Before Man goes to the stars he should learn how to live on Earth .

Much of what we see in the universe ... starts out as imaginary. Often you must imagine something before you can come to terms with it.

These are the stories the Dogs tell, when the fires burn high and the wind is from the north.

Time is still the great mystery to us. It is no more than a concept; we don't know if it even exists.

If mankind were to continue in other than the present barbarism, a new path must be found, a new civilization based on some other method than technology

It would seem to me that by the time a race has achieved deep space capability it would have matured to a point where it would have no thought of dominating another intelligent species.

Inside the time bubble we do not age. We age only when we are outside of it.

When I talk of the purpose of life, I am thinking not only of human life, but of all life on Earth and of the life which must exist upon other planets throughout the universe.

Here lies one from a distant star, but the soil is not alien to him, for in death he belongs to the universe.

It's the oasis, " said the camel driver."Well, why don't we go there right now?" the boy asked."Because we have to sleep.

Generosity without delicacy, like wit without judgement, generally gives as much pain as pleasure.

I don't have to have faith, I have experience.

An autobiography is not about pictures; it's about the stories; it's about honesty and as much truth as you can tell without coming too close to other people's privacy.

When you're young, you think you can handle anything. By the time you find out otherwise, it's already too late. You got a stocking wrapped around your neck.

When people's ill, they come to I, I Physics, bleeds, and sweats 'em; Sometimes they live, sometimes they die. What's that to I? I lets 'em.

...the lesson of forever and ever is that knowing a man's mind ain't knowing the man.

Nature is all that we think we know plus all that we don't know whether or not we know that we don't know it.

I stopped drinking almost immediately after I had ready access to liquor, when I got to college. It almost immediately lost its appeal for me.

As a citizen, you have a duty to ask what is true and what is false.