If WE claim only reasonable probability, it will be as much as men who love the truth can ever at any given moment hope to have within their grasp.

Ingenuity in meeting and pursuing the pupil, that tact for the concrete situation, though they are the alpha and omega of the teacher's art, are things to which psychology cannot help us in the least.

Intelligence is a fixed goal with variable means of achieving it.

The self-same atoms which, chaotically dispersed, made the nebula, now, jammed and temporarily caught in peculiar positions, form our brains; and the 'evolution' of brains, if understood, would be simply the account of how the atoms came to be so caught and jammed.

We must not just patch and tinker with life. We must keep renewing it. Embrace novelty and uniqueness.

Philosophy lives in words, but truth and fact well up into our lives in ways that exceed verbal formulation. There is in the living act of perception always something that glimmers and twinkles and will not be caught, and for which reflection comes too late.

We never fully grasp the import of any true statement until we have a clear notion of what the opposite untrue statement would be.