“The search of science for the spirits has been neither long nor earnest; nor is it a matter of surprise that it has not been undertaken earlier by men whose training had fitted them for the work.”

No other substance but this could produce the human molecule. I know very well that this idea of spirit-matter is regarded as a hybrid monster, a verbal exorcism of a duality which remains unresolved in its terms. But I remain convinced that the objections made to it arise from the mere fact that few people can make up their minds to abandon an old point of view and take the risk of a new idea. … Biologists or philosophers cannot conceive a biosphere or noosphere because they are unwilling to abandon a certain narrow conception of individuality. Nevertheless, the step must be taken. For in fact, pure spirituality is as unconceivable as pure materiality. Just as, in a sense, there is no geometrical point, but as many structurally different points as there are methods of deriving them from different figures, so every spirit derives its reality and nature from a particular type of universal synthesis.
A Sketch of a Personalistic Universe (1936)

A Sketch of a Personalistic Universe (1936)
Context: There is neither spirit nor matter in the world; the stuff of the universe is spirit-matter. No other substance but this could produce the human molecule. I know very well that this idea of spirit-matter is regarded as a hybrid monster, a verbal exorcism of a duality which remains unresolved in its terms. But I remain convinced that the objections made to it arise from the mere fact that few people can make up their minds to abandon an old point of view and take the risk of a new idea. … Biologists or philosophers cannot conceive a biosphere or noosphere because they are unwilling to abandon a certain narrow conception of individuality. Nevertheless, the step must be taken. For in fact, pure spirituality is as unconceivable as pure materiality. Just as, in a sense, there is no geometrical point, but as many structurally different points as there are methods of deriving them from different figures, so every spirit derives its reality and nature from a particular type of universal synthesis.

By the Waters of Babylon (1937)

The Trouble With Being Born (1973)

Science and the Unseen World (1929), IX, p.88

Rome, or Reason? A Reply to Cardinal Manning. Part I. The North American Review (1888)
Context: Among the “some two hundred and fifty-eight” Vicars of Christ there were probably some good men. This would have happened even if the intention had been to get all bad men, for the reason that man reaches perfection neither in good nor in evil; but if they were selected by Christ himself, if they were selected by a church with a divine origin and under divine guidance, then there is no way to account for the selection of a bad one. If one hypocrite was duly elected pope—one murderer, one strangler, one starver—this demonstrates that all the popes were selected by men, and by men only, and that the claim of divine guidance is born of zeal and uttered without knowledge.

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter I, Sec. 17

Source: The First Men in the Moon (1901), Ch. 24: The Natural History of the Selenites

As quoted by W. K. Hancock in SMUTS 2: The Fields of Force 1919-1950, p. 395