The conflict of forces and the struggle of opposing wills are of the essence of our universe and alone hold it together.

Socialism also brings us up against the hard rock of eugenic fact which, if we neglect it, will dash our most beautiful social construction to fragments.

The second great channel through which the impulse towards the control of procreation for the elevation of the race is entering into practical life is by the general adoption, by the educated—of methods for the prevention of conception except when conception is deliberately desired.

The romantic embrace can only be compared with music and with prayer.

Life is livable because we know that wherever we go most of the people we meet will be restrained in their actions towards us by an almost instinctive network of taboos.

Mankind is becoming a single unit, and that for a unit to fight against itself is suicide.

All civilization has from time to time become a thin crust over a volcano of revolution.