Time: That which man is always trying to kill, but which ends in killing him.

Practical atheism, seeing no guidance for human affairs but its own limited foresight, endeavors itself to play the god, and decide what will be good for mankind and what bad.

That feelings of love and hate make rational judgments impossible in public affairs, as in private affairs, we can clearly enough see in others, though not so clearly in ourselves.

The tyrant is nothing but a slave turned inside out.

This survival of the fittest which I have here sought to express in mechanical terms, is that which Mr. Darwin has called "natural selection", or the preservation of favoured races in the struggle for life.

We must infer that a plant or animal of any species, is made up of special units, in all of which there dwells the intrinsic aptitude to aggregate into the form of that species: just as in the atoms of a salt, there dwells the intrinsic aptitude to crystallize in a particular way.‎

To play billiards well was a sign of an ill-spent youth