We tolerate shapes in human beings that would horrify us if we saw them in a horse.

The wealth of a soul is measured by how much it can feel; its poverty by how little.

Over-population is a phenomenon connected with the survival of the unfit, and it is a mechanism which has created conditions favourable to the survival of the unfit and the elimination of the fit.

The great discovery of the nineteenth century, that we are of one blood with the lower animals, has created new ethical obligations which have not yet penetrated the public conscience. The clerical profession has been lamentably remiss in preaching this obvious duty.

No healthy civilization can ever be reared on a foundation of devitalized work.

The statistics of suicide show that, for non-combatants at least, life is more interesting in war than in peace.

Let none of us delude himself by supposing that honesty is always the best policy. It is not.