No man ever quite believes in any other man.

The notion that science does not concern itself with first causes - that it leaves the field to theology or metaphysics, and confines itself to mere effects - this notion has no support in the plain facts. If it could, science would explain the origin of life on earth at once - and there is every reason to believe that it will do so on some not too remote tomorrow. To argue that gaps in knowledge which will confront the seeker must be filled, not by patient inquiry, but by intuition or revelation, is simply to give ignorance a gratuitous and preposterous dignity.

I go on working for the same reason that a hen goes on laying eggs. There is in every living creature an obscure but powerful impulse to active functioning. Life demands to be lived. Inaction, save as a measure of recuperation between bursts of activity, is painful and dangerous to the healthy organism- in fact, it is almost impossible. Only the dying can be really idle.

Every lynching deprives its victim of his life without due process of law, and denies him an equal protection of the law. The States are charged with punishing all such invasions as the common rights of the citizens, but some of them have failed in their effort to do so, and others have not honestly tried. Meanwhile, lynchings continue, and though they do not increase in number, they show some tendency to increase in savagery.

There are no dull subjects. There are only dull writers.

[Science] must be amoral by its very nature: The minute it begins separating facts into the two categories of good ones and bad ones it ceases to be science and becomes a mere nuisance, like theology.

A metaphysician is one who, when you remark that twice two makes four, demands to know what you mean by twice, what by two, what by makes, and what by four. For asking such questions metaphysicians are supported in oriental luxury in the universities, and respected as educated and intelligent men.