Letters

³ In the second place, as to your opinion that it is possible for the mind to form to itself images of material things independently of the services of the bodily senses, this is refuted by the following argument:— If the mind is able, before it uses the body as its instrument in perceiving material objects, to form to itself the images of these; and if, as no sane man can doubt, the mind received more reliable and correct impressions before it was involved in the illusions which the senses produce, it follows that we must attribute greater value to the impressions of men asleep than of men awake, and of men insane than of those who are free from such mental disorder: for they are, in these states of mind, impressed by the same kind of images as impressed them before they were indebted for information to these most deceptive messengers, the senses; and thus, either the sun which they see must be more real than the sun which is seen by men in their sound judgment and in their waking hours, or that which is an illusion must be better than what is real. But if these conclusions, my dear Nebridius, are, as they obviously are, wholly absurd, it is demonstrated that the image of which you speak is nothing else than a blow inflicted by the senses, the function of which in connection with these images is not, as you write, the mere suggestion or admonition occasioning their formation by the mind within itself, but the actual bringing in to the mind, or, to speak more definitely, impressing upon it of the illusions to which through the senses we are subject. The difficulty which you feel as to the question how it comes to pass that we can conceive in thought, faces and forms which we have never seen, is one which proves the acuteness of your mind. I shall therefore do what may extend this letter beyond the usual length; not, however, beyond the length which you will approve, for I believe that the greater the fullness with which I write to you, the more welcome shall my letter be.

4. I perceive that all those images which you as well as many others call phantasiæ, may be most conveniently and accurately divided into three classes, according as they originate with the senses, or the imagination, or the faculty of reason. Examples of the first class are when the mind forms within itself and presents to me the image of your face, or of Carthage, or of our departed friend Verecundus, or of any other thing at present or formerly existing, which I have myself seen and perceived. Under the second class come all things which we imagine to have been, or to be so and so: e.g. when, for the sake of illustration in discourse, we ourselves suppose things which have no existence, but which are not prejudicial to truth; or when we call up to our own minds a lively conception of the things described while we read history, or hear, or compose, or refuse to believe fabulous narrations. Thus, according to my own fancy, and as it may occur to my own mind, I picture to myself the appearance of Æneas, or of Medea with her team of winged dragons, or of Chremes, or Parmeno. To this class belong also those things which have been brought forward as true, either by wise men wrapping up some truth in the folds of such inventions, or by foolish men building up various kinds of superstition; e.g. the Phlegethon of Tortures, and the five caves of the nation of darkness, and the North Pole supporting the heavens, and a thousand other prodigies of poets and of heretics. Moreover, we often say, when carrying on a discussion, “Suppose that three worlds, such as the one which we inhabit, were placed one above another;” or, “Suppose the earth to be enclosed within a four-sided figure,” and so on: for all such things we picture to ourselves, and imagine according to the mood and direction of our thoughts. As for the third class of images, it has to do chiefly with numbers and measure; which are found partly in the nature of things, as when the figure of the entire world is discovered, and an image consequent upon this discovery is formed in the mind of one thinking upon it; and partly in sciences, as in geometrical figures and musical harmonies, and in the infinite variety of numerals: which, although they are, as I think, true in themselves as objects of the understanding, are nevertheless the causes of illusive exercises of the imagination, the misleading tendency of which reason itself can only with difficulty withstand; although it is not easy to preserve even the science of reasoning free from this evil, since in our logical divisions and conclusions we form to ourselves, so to speak, calculi or counters to facilitate the process of reasoning.

5. In this whole forest of images, I believe that you do not think that those of the first class belong to the mind previous to the time when they find access through the senses. On this we need not argue any further. As to the other two classes a question might reasonably be raised, were it not manifest that the mind is less liable to illusions when it has not yet been subjected to the deceptive influence of the senses, and of things sensible; and yet who can doubt that these images are much more unreal than those with which the senses acquaint us? For the things which we suppose, or believe, or picture to ourselves, are in every point wholly unreal; and the things which we perceive by sight and the other senses, are, as you see, far more near to the truth than these products of imagination. As to the third class, whatever extension of body in space I figure to myself in my mind by means of an image of this class, although it seems as if a process of thought had produced this image by scientific reasonings which did not admit of error, nevertheless I prove it to be deceptive, these same reasonings serving in turn to detect its falsity. Thus it is wholly impossible for me to believe [as, accepting your opinion, I must believe] that the soul, while not yet using the bodily senses, and not yet rudely assaulted through these fallacious instruments by that which is mortal and fleeting, lay under such ignominious subjection to illusions.