Change is not progress.

Men always try to make virtues of their weaknesses. Fear of death and fear of life both become piety.

The believing mind is externally impervious to evidence. The most that can be accomplished with it is to induce it to substitute one delusion for another. It rejects all overt evidence as wicked.

No man of honor ever quite lives up to his code, any more than a moral man manages to avoid sin.

Life without sex might be safer but it would be unbearably dull. It is the sex instinct which makes women seem beautiful, which they are once in a blue moon, and men seem wise and brave, which they never are at all. Throttle it, denaturalize it, take it away, and human existence would be reduced to the prosaic, laborious, boresome, imbecile level of life in an anthill.

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.

This passion, so unordered and yet so potent, explains the capacity for teaching that one frequently observes in scientific men of high attainments in their specialties-for example, Huxley, Ostwald, Karl Ludwig, Virchow, Billroth, Jowett, William G. Sumner, Halsted and Osler-men who knew nothing whatever about the so-called science of pedagogy, and would have derided its alleged principles if they had heard them stated.