It was mostly sweet," he whispered, "and you were the sweetest of all.

There is in each of us an ancient force that takes and an ancient force that gives. A man finds little difficulty facing that place within himself where the taking force dwells, but it's almost impossible for him to see into the giving force without changing into something other than man. For a woman, the situation is reversed. ... These things are so ancient within us that they're ground into each separate cell of our bodies... It's as easy to be overwhelmed by giving as by taking.

Once human beings realize something can be done, they're not satisfied until they've done it.

We faced it and did not resist. The storm passed through us and around us. It's gone, but we remain.

If all those around you believe some particular thing, you will soon be tempted to share in that belief.

The child who refuses to travel in the father's harness, this is the symbol of man's most unique capability. "I do not have to be what my father was. I do not have to obey my father's rules or even believe everything he believed. It is my strength as a human that I can make my own choices of what to believe and what not to believe, of what to be and what not to be.

We are generalists. You can't draw neat lines around planet-wide problems. Planetology is a cut-and-fit science.