Ethics, Part I, Proposition 36
There is no cause from whose nature some effect does not follow.
Proof
Whatsoever exists expresses God's nature or essence in a given conditioned manner (by Prop. xxv., Coroll.); that is, (by Prop. xxxiv.), whatsoever exists, expresses in a given conditioned manner God's power, which is the cause of all things, therefore an effect must (by Prop. xvi.) necessarily follow. Q.E.D.
Benedict de Spinoza, The Ethics (Ethica Ordine Geometrico Demonstrata), translated from the Latin by R. H. M. Elwes.
First published in The Chief Works of Benedict de Spinoza, vol. II (London: George Bell and Sons, 1884).
This translation is out of copyright in the United States, where it was published in 1884, and wherever the copyright term is the author's life plus 100 years or less; its translator died in 1892.
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Digital text: Project Gutenberg eBook #3800