One of the troubles about vanity is that it grows with what it feeds on. The more you are talked about, the more you will wish to be talked about.

Aristotle's metaphysics, roughly speaking, may be described as Plato diluted by common sense. He is difficult because Plato and common sense do not mix easily.

It is because modern education is so seldom inspired by a great hope that it so seldom achieves great results. The wish to preserve the past rather that the hope of creatingfuture dominates the minds of those who control the teaching of the young.

Children, after being limbs of Satan in traditional theology and mystically illuminated angels in the minds of educational reformers, have reverted to being little devils; not theological demons inspired by the evil one, but scientific Freudian abominations inspired by the unconscious.

History is valuable, to begin with, because it is true; and this, though not the whole of its value, is the foundation and condition of all the rest. That all knowledge, as such, is in some degree good, would appear to be at least probable; and the knowledge of every historical fact possesses this element of goodness, even if it posses no other.

Logic must no more admit a unicorn than zoology can.

Although this may seem a paradox, all exact science is dominated by the idea of approximation. When a man tells you that he knows the exact truth about anything, you are safe in inferring that he is an inexact man. Every careful measurement in science is always given with the probable error ... every observer admits that he is likely wrong, and knows about how much wrong he is likely to be.