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Men are limited by the knowledge of their minds, the worth of their characters and the principles upon which they are building their lives.

Men who wish to know about the world must learn about it in its particular details.

Men have always shown a dim knowledge of their better potentialities by paying homage to those purest leaders who taught the simplest and most inclusive rules for an undivided mankind.

The world has the habit of making room for the man whose actions show that he knows where he is going.

Men of routine or men who can do what they are told are not hard to find; but men who can think and plan and tell the routine men what to do are very rare.

Men act like brutes in so far as the sequences of their perceptions arise through the principle of memory only, like those empirical physicians who have mere practice without theory.

It seems to me that man is made to act rather than to know: the principles of things escape our most persevering researches.

Men honor what lies within the sphere of their knowledge, but do not realize how dependent they are on what lies beyond it.

There are no extraordinary men... just extraordinary circumstances that ordinary men are forced to deal with.

Every man takes the limits of his own field of vision for the limits of the world.