A fourth-grade reader may be a sixth-grade mathematician. The grade is an administrative device which does violence to the nature of the developmental process.

Overcrowding can be corrected only by inducing people not to crowd, and the environment will continue to deteriorate until polluting practices are abandoned.

Some of us learn control, more or less by accident. The rest of us go all our lives not even understanding how it is possible, and blaming our failure on being born the wrong way.

It is a mistake to suppose that the whole issue is how to free man. The issue is to improve the way in which he is controlled.

Many social practices essential to the welfare of the species involve the control of one person by another, and no one can suppress them who has any concern for human achievements

If you're old, don't try to change yourself, change your environment.

The evolution of cultures appears to follow the pattern of the evolution of species. The many different forms of culture which arise correspond to the "mutations" of genetic theory. Some forms prove to be effective under prevailing circumstances and others not, and the perpetuation of the culture is determined accordingly.