We with our lives are like islands in the sea, or like trees in the forest... But the trees also commingle their roots in the darkness underground.

The entire routine of our memorized acquisitions, for example, is a consequence of nothing but the Law of Contiguity. The words of a poem, the formulas of trigonometry, the facts of history, the properties of material things, are all known to us as definite systems or groups of objects which cohere in an order fixed by innumerable iterations, and of which any one part reminds us of the others.

If you want a quality, act as if you already had it.

Man lives for science as well as bread.

In order to disprove the assertion that all crows are black, one white crow is sufficient.

How can the moribund old man reason back to himself the romance, the mystery, the imminence of great things with which our old earth tingled for him in the days when he was young and well?

True ideas are those that we can assimilate, validate, corroborate, and verify. False ideas are those that we cannot