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Selected Correspondence:
Letter 30 (17) Spinoza to Peter Balling [N1]

[Concerning omens and phantoms. The mind may have a confused presentiment of the future.]
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Beloved Friend, --Your last letter, written, if I mistake not, on the 26th of last month, has duly reached me. It caused me no small sorrow and solicitude, though the feeling sensibly diminished when I reflected on the good sense and fortitude, with which you have known how to despise the evils of fortune, or rather of opinion, at a time when they most bitterly assailed you. Yet my anxiety increases daily; I therefore beg and implore you by the claims of our friendship, that you will rouse yourself to write me a long letter. With regard to Omens, of which you make mention in telling me that, while your child was still healthy and strong, you heard groans like those he uttered when he was ill and shortly afterwards died, I should judge that these were not real groans, but only the effect of your imagination; for you say that, when you got up and composed yourself to listen, you did not hear them so clearly either as before or as afterwards, when you had fallen asleep again. This, I think, shows that the groans were purely due to the imagination, which, when it was unfettered and free, could imagine groans more forcibly and vividly than when you sat up in order to listen in a particular direction. I think I can both illustrate and confirm what I say by another occurrence, which befell me at Rhijnsburg last winter. When one morning, after the day had dawned, I woke up from a very unpleasant dream, the images, which had presented themselves to me in sleep, remained before my eyes just as vividly as though the things had been real, especially the image of a certain black and leprous Brazilian whom I had never seen before. This image disappeared for the most part when, in order to divert my thoughts, I cast my eyes on a book, or something else. But, as soon as I lifted my eyes again without fixing my attention on any particular object, the same image of this same negro appeared with the same vividness again and again, until the head of it gradually vanished. I say that the same thing, which occurred with regard to my inward sense of sight, occurred with your hearing; but as the causes were very different, your case was an omen and mine was not. The matter may be clearly grasped by means of what I am about to say. The effects of the imagination arise either from bodily or mental causes. I will proceed to prove this, in order not to be too long, solely from experience. We know that fevers and other bodily ailments are the causes of delirium, and that persons of stubborn disposition imagine nothing but quarrels, brawls, slaughterings, and the like. We also see that the imagination is to a certain extent determined by the character of the disposition, for, as we know by experience, it follows in the tracks of the understanding in every respect, and arranges its images and words, just as the understanding arranges its demonstrations and connects one with another; so that we are hardly at all able to say, what will not serve the imagination as a basis for some image or other. This being so, I say that no effects of imagination springing from physical causes can ever be omens of future events; inasmuch as their causes do not involve any future events. But the effects of imagination, or images originating in the mental disposition, may be omens of some future event; inasmuch as the mind may have a confused presentiment of the future. It may, therefore, imagine a future event as forcibly and vividly, as though it were present; for instance a father (to take an example resembling your own) loves his child so much, that he and the beloved child are, as it were, one and the same. And since (like that which I demonstrated on another occasion) there must necessarily exist in thought the idea of the essence of the child's states and their results, and since the father, through his union with his child, is a part of the said child, the soul of the father must necessarily participate in the ideal essence of the child and his states, and in their results, as I have shown at greater length elsewhere.

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Again, as the soul of the father participates ideally in the consequences of his child's essence, he may (as I have said) sometimes imagine some of the said consequences as vividly as if they were present with him, provided that the following conditions are fulfilled: --I. If the occurrence in his son's career be remarkable. II. If it be capable of being readily imagined. III. If the time of its happening be not too remote. IV. If his body be sound, in respect not only of health but of freedom from every care or business which could outwardly trouble the senses. It may also assist the result, if we think of something which generally stimulates similar ideas. For instance, if while we are talking with this or that man we hear groans, it will generally happen that, when we think of the man again, the groans heard when we spoke with him will recur to our mind. This, dear friend, is my Opinion on the question you ask me. I have, I confess, been very brief, but I have furnished you with material for writing to me on the first opportunity, &c.

Voorburg, 20 July, 1664.

[Note N1]: This letter is from a Latin version of a Dutch original. For Balling, see Letter 26, and note there.
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