Broadly speaking, we are in the middle of a race between human skill as a means and human folly as an end.

Men who allow their love of power to give them a distorted view of the world are to be found in every asylum: one man will think he is the Governor of the Bank of England, another will think he is the King, and yet another will think he is God. Highly similar delusions, if expressed by educated men in obscure language, lead to professorships of philosophy; and if expressed by emotional men in eloquent language, lead to dictatorships.

The man who only loves beautiful things is dreaming, whereas the man who knows absolute beauty is wide awake.

What Galileo and Newton were to the seventeenth century, Darwin was to the nineteenth.

None but a coward dares to boast that he has never known fear.

Have no respect for the authority of others, for there are always contrary authorities to be found

Ethical metaphysics is fundamentally an attempt, however disguised, to give legislative force to our own wishes.