The recognition that no knowledge can be complete, no metaphor entire, is itself humanizing. It counteracts fanaticism. It grants even to adversaries the possibility of partial truth, and to oneself the possibility of error.

If we do not learn from history, we shall be compelled to relive it. True. But if we do not change the future, we shall be compelled to endure it. And that could be worse.

It is better to err on the side of daring than the side of caution.

Man has a limited biological capacity for change. When this capacity is overwhelmed, the capacity is in future shock.

You can use all the quantitative data you can get, but you still have to distrust it and use your own intelligence and judgment.

The computer is a greater threat to the [nuclear] family than all the abortion laws and gay rights movements and pornography in the world.

We will only keep people from fleeing the countryside into urban favelas, villas miseries, shantytowns and squatter villages when the productivity gap is closed between what brute labor on the soil can accomplish and what advanced technology makes possible today - and will make possible tomorrow.