Front Page Titles (by Subject) LETTER LXXII. (LXXXIII.): Spinoza to * * * * 1 - The Chief Works of Benedict de Spinoza, vol. 2
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LETTER LXXII. (LXXXIII.): Spinoza to * * * * 1 - Benedict de Spinoza, The Chief Works of Benedict de Spinoza, vol. 2 
The Chief Works of Benedict de Spinoza, translated from the Latin, with an Introduction by R.H.M. Elwes, vol. 2 De Intellectus Emendatione - Ethica. (Select Letters). Revised edition (London: George Bell and Sons, 1901).
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LETTER LXXII. (LXXXIII.)
Spinoza to * * * *1
[Spinoza gives the required explanation. Mentions the treatise of Huet, &c.]
With regard to your question as to whether the variety of the universe can be deduced à priori from the conception of extension only, I believe I have shown clearly enough already that it cannot; and that, therefore, matter has been ill-defined by Descartes as extension; it must necessarily be explained through an attribute, which expresses eternal and infinite essence. But perhaps, some day, if my life be prolonged, I may discuss the subject with you more clearly. For hitherto I have not been able to put any of these matters into due order.
As to what you add; namely, that from the definition of a given thing considered in itself we can only deduce a single property, this is, perhaps, true in the case of very simple things (among which I count figures), but not in realities. For, from the fact alone, that I define God as a Being to whose essence belongs existence, I infer several of His properties; namely, that He necessarily exists, that He is One, unchangeable, infinite, &c. I could adduce several other examples, which, for the present, I pass over.
In conclusion, I ask you to inquire, whether Huet’s treatise (against the “Tractatus Theologico-Politicus”) about which I wrote to you before, has yet been published, and whether you could send me a copy. Also, whether you yet know, what are the new discoveries about refraction. And so farewell, dear Sir, and continue to regard yours, &c.
The Hague, 15 July, 1676.
[1 ] Tschirnhausen.