If the society toward which we are developing is not to be a nightmare of exhaustion, we must use the interlude of the present era to develop a new technology which is based on a circular flow of materials such that the only sources of man's provisions will be his own waste products.

At the opposite pole from the gift is tribute - that is, a grant made out of fear and under threat. A threat is a statement of the form "you do something that I want or I will do something that you do not want.

Any attempt to reduce the complex properties of biological organisms or of nervous systems or of human brains to simple physical and chemical systems is foolish.

[The question for the behavioral disciplines is simply] what is better, and how do we get there?

We make our tools, and then they shape us.

Know this: though love is weak and hate is strong, Yet hate is short, and love is very long.

The future is bound to surprise us, but we don't have to be dumbfounded.