We are compelled by reflection to recognize that God is not to be placed against the material world [as in Christianity], but must be placed as a 'divine power' or 'moving spirit' within the cosmos itself ... All the wonderful phenomena of nature around us, organic as well as inorganic, are only various products of one and the same original force.

Civilization and the life of nations are governed by the same laws as prevail throughout nature and organic life.

The real cause of personal existence is not the favor of the Almighty, but the sexual love of one's earthly parents.

Ontogeny re-capitulates phylogeny.

Among the Spartans all newly born children were subject to a careful examination or selection. All those that were weak, sickly, or affected with any bodily infirmity, were killed. Only the perfectly healthy and strong children were allowed to live, and they alone afterwards propagated the race.

There is no doubt that the course and character of the feared 'European war'... will become the first world war in the full sense of the word.

Man is not distinguished from [the animals] by a special kind of soul, or by any peculiar and exclusive psychic function, but only by a higher degree of psychic activity, a superior stage of development.