To confine our attention to terrestrial matters would be to limit the human spirit.

[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.

You may see a cup of tea fall off a table and break into pieces on the floor... But you will never see the cup gather itself back together and jump back on the table. The increase of disorder, or entropy, is what distinguishes the past from the future, giving a direction to time.

The wise never marry, and when they marry they become otherwise.

Many badly needed goals, like fusion and cancer cure, would be achieved much sooner if we invested more.

I don't think the human race will survive the next thousand years, unless we spread into space.

I don't have much positive to say about motor neuron disease, but it taught me not to pity myself because others were worse off, and to get on with what I still could do. I'm happier now than before I developed the condition.