The real persuaders are our appetites, our fears and above all our vanity. The skillful propagandist stirs and coaches these internal persuaders.

We find it hard to apply the knowledge of ourselves to our judgment of others. The fact that we are never of one kind, that we never love without reservations and never hate with all our being cannot prevent us from seeing others as wholly black or white.

By all odds, earliest man, so naked to the elements and to deadly enemies, should have existed in a state of constant shock. We find him instead the only lighthearted being in a deadly serious universe.... He alone, with childish carelessness, tinkered and played, and exerted himself more in the pursuit of superfluities than of necessities. Yet the tinkering and playing, and the fascination with the nonessential, were a chief source of the inventiveness which enabled man to prevail over better-equipped and more-purposeful animals.

Intolerance is the ''Do Not Touch'' sign on something that cannot bear touching. We do not mind having our hair ruffled, but we will not tolerate any familiarity with the toupee which covers our baldness.

Even the sober desire for progress is sustained by faith—faith in the intrinsic goodness of human nature and in the omnipotence of science. It is a defiant and blasphemous faith, not unlike that held by the men who set out to build a "city and a tower, whose top may reach unto heaven" and who believed that "nothing will be restrained from them, which they have imagined to do.

Unpredictability, too, can become monotonous.

We feel free when we escape - even if it be but from the frying pan to the fire.