Front Page Titles (by Subject) LETTER II. (II.): Spinoza to Oldenburg. - The Chief Works of Benedict de Spinoza, vol. 2
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LETTER II. (II.): Spinoza to Oldenburg. - 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 II. (II.)
Spinoza to Oldenburg.
[Answer to Letter I. Spinoza defines “God,” and “attribute,” and sends definitions, axioms, and first four propositions of Book I. of Ethics. Some errors of Bacon and Descartes discussed.]
How pleasant your friendship is to me, you may yourself judge, if your modesty will allow you to reflect on the abundance of your own excellences. Indeed the thought of these makes me seem not a little bold in entering into such a compact, the more so when I consider that between friends all things, and especially things spiritual, ought to be in common. However, this must lie at the charge of your modesty and kindness rather than of myself. You have been willing to lower yourself through the former and to fill me with the abundance of the latter, till I am no longer afraid to accept the close friendship, which you hold out to me, and which you deign to ask of me in return; no effort on my part shall be spared to render it lasting.
As for my mental endowments, such as they are, I would willingly allow you to share them, even though I knew it would be to my own great hindrance. But this is not meant as an excuse for denying to you what you ask by the rights of friendship. I will therefore endeavour to explain my opinions on the topics you touched on; though I scarcely hope, unless your kindness intervene, that I shall thus draw the bonds of our friendship closer.
I will then begin by speaking briefly of God, Whom I define as a Being consisting in infinite attributes, whereof each is infinite or supremely perfect after its kind. You must observe that by attribute I mean everything, which is conceived through itself and in itself, so that the conception of it does not involve the conception of anything else. For instance, extension is conceived through itself and in itself, but motion is not. The latter is conceived through something else, for the conception of it implies extension.
That the definition above given of God is true appears from the fact, that by God we mean a Being supremely perfect and absolutely infinite. That such a Being exists may easily be proved from the definition; but as this is not the place for such proof, I will pass it over. What I am bound here to prove, in order to satisfy the first inquiry of my distinguished questioner, are the following consequences; first, that in the universe there cannot exist two substances without their differing utterly in essence; secondly, that substance cannot be produced or created—existence pertains to its actual essence; thirdly, that all substance must be infinite or supremely perfect after its kind.
When these points have been demonstrated, my distinguished questioner will readily perceive my drift, if he reflects at the same time on the definition of God. In order to prove them clearly and briefly, I can think of nothing better than to submit them to the bar of your judgment proved in the geometrical method.1 I therefore enclose them separately and await your verdict upon them.
Again, you ask me what errors I detect in the Cartesian and Baconian philosophies. It is not my custom to expose the errors of others, nevertheless I will yield to your request. The first and the greatest error is, that these philosophers have strayed so far from the knowledge of the first cause and origin of all things; the second is, that they did not know the true nature of the human mind; the third, that they never grasped the true cause of error. The necessity for correct knowledge on these three points can only be ignored by persons completely devoid of learning and training.
That they have wandered astray from the knowledge of the first cause, and of the human mind, may easily be gathered from the truth of the three propositions given above; I therefore devote myself entirely to the demonstration of the third error. Of Bacon I shall say very little, for he speaks very confusedly on the point, and works out scarcely any proofs: he simply narrates. In the first place he assumes, that the human intellect is liable to err, not only through the fallibility of the senses, but also solely through its own nature, and that it frames its conceptions in accordance with the analogy of its own nature, not with the analogy of the universe, so that it is like a mirror receiving rays from external objects unequally, and mingling its own nature with the nature of things, &c.
Secondly, that the human intellect is, by reason of its own nature, prone to abstractions; such things as are in flux it feigns to be constant, &c.
Thirdly, that the human intellect continually augments, and is unable to come to a stand or to rest content. The other causes which he assigns may all be reduced to the one Cartesian principle, that the human will is free and more extensive than the intellect, or, as Verulam himself more confusedly puts it, that “the understanding is not a dry light, but receives infusion from the will.”1 (We may here observe that Verulam often employs “intellect” as synonymous with mind, differing in this respect from Descartes). This cause, then, leaving aside the others as unimportant, I shall show to be false; indeed its falsity would be evident to its supporters, if they would consider, that will in general differs from this or that particular volition in the same way as whiteness differs from this or that white object, or humanity from this or that man. It is, therefore, as impossible to conceive, that will is the cause of a given volition, as to conceive that humanity is the cause of Peter and Paul.
Hence, as will is merely an entity of the reason, and cannot be called the cause of particular volitions, and as some cause is needed for the existence of such volitions, these latter cannot be called free, but are necessarily such as they are determined by their causes; lastly, according to Descartes, errors are themselves particular volitions; hence it necessarily follows that errors, or, in other words, particular volitions, are not free, but are determined by external causes, and in nowise by the will. This is what I undertook to prove.
[1 ] The allusion is to Eth. I., Beginning—Prop. iv.
[1 ] Bacon, Nov. Org. I. Aph. 49.