Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying.

The rash assertion that "God made man in His own image" is ticking like a time bomb at the foundation of many faiths.

Anything that is theoretically possible will be achieved in practice, no matter what the technical difficulties are, if it is desired greatly enough.

Now times had changed, and the inherited wisdom of the past had become folly.

A faith that cannot survive collision with the truth is not worth many regrets.

... chemistry is a trade for people without enough imagination to be physicists.

In my life I have found two things of priceless worth - learning and loving. Nothing else - not fame, not power, not achievement for its own sake - can possible have the same lasting value. For when your life is over, if you can say 'I have learned' and 'I have loved,' you will also be able to say 'I have been happy.