Human nature, as manifested in tribalism and nationalism, provides the momentum of the machinery of human evolution.

No tempting form of error is without some latent charm derived from truth.

As long as man remains an inquiring animal, there can never be a complete unanimity in our fundamental beliefs. The more diverse our paths, the greater is likely to be the divergence of beliefs.

Reason has not tamed desire: it is as strong as ever.

The course of human history is determined, not by what happens in the skies, but what takes place in our hearts.

In every man there is an instinctive and passionate reaction if his person or liberty is attacked.

Tribal life comes automatically to an end when a primitive people begins to live in a town or a city, for sooner or later a tribal organization is found to be incompatible with life in a city.