“We do not know nature; causes hidden in her breast might have produced everything. In your turn, observe the polyp of Trembley: does it not contain in itself the causes which bring about regeneration? Why then would it be absurd to think that there are physical causes by reason of which everything has been made, and to which the whole chain of this vast universe is so necessarily bound and held that, nothing which happens, could have failed to happen,—causes, of which we are so invincibly ignorant that we have had recourse to a God, who, as some aver, is not so much as a logical entity? Thus to destroy chance is not to prove the existence of a supreme being, since there may be some other thing which is neither chance nor God—I mean, nature. It follows that the study of nature can make only unbelievers; and the way of thinking of all its more successful investigators proves this.”
As quoted by Julien Offray de La Mettrie, Man a Machine (1747) Tr. Gertrude Carman Bussey https://books.google.com/books?id=GKYLAQAAIAAJ&pg=PA125 (1912)
Pensées Philosophiques (1746)
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Denis Diderot 106
French Enlightenment philosopher and encyclopædist 1713–1784Related quotes

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Source: Five Questions Concerning the Mind (1495), p. 201

1790s, Discourse to the Theophilanthropists (1798)
Context: As to that which is called nature, it is no other than the laws by which motion and action of every kind, with respect to unintelligible matter, is regulated. And when we speak of looking through nature up to nature's God, we speak philosophically the same rational language as when we speak of looking through human laws up to the power that ordained them.
God is the power of first cause, nature is the law, and matter is the subject acted upon.
But infidelity by ascribing every phenomenon to properties of matter, conceives a system for which it cannot account, and yet it pretends to demonstration. It reasons from what it sees on the surface of the earth, but it does not carry itself on the solar system existing by motion. It sees upon the surface a perpetual decomposition and recomposition of matter. It sees that an oak produces an acorn, an acorn an oak, a bird an egg, an egg a bird, and so on. In things of this kind it sees something which it calls a natural cause, but none of the causes it sees is the cause of that motion which preserves the solar system.