I do not believe in using women in combat, because females are too fierce.

War is only an invention, not a biological necessity.

WE MUST DEVISE A SYSTEM IN WHICH PEACE IS MORE REWARDING THAN WAR.

Ninety-nine percent of the time humans have lived on this planet we've lived in tribes, groups of 12 to 36 people. Only during times of war, or what we have now, which is the psychological equivalent of war, does the nuclear family prevail, because it's the most mobile unit that can ensure the survival of the species. But for the full flowering of the human spirit we need groups, tribes.

Warfare ... is just an invention, older and more widespread than the jury system, but none the less an invention.

The most intractable problem today is not pollution or technology or war; but the lack of belief that the future is very much in the hands of the individual.

All of us who grew up before World War II are immigrants in time, immigrants from an earlier world, living in an age essentially different from anything we knew before.