From In Search of Lost Time by Marcel Proust:
Next to this central belief which, while I was reading, would be constantly reaching out from my inner self to the outer world, towards the discover of truth, came the emotions aroused in me by the action in which I was taking part, for these afternoons were crammed with more dramatic events than occur, often, in a whole lifetime. These were the events taking place in the book I was reading. It is true that the people concerned in them were not what Françoise would have called "real people." But none of the feelings which the joys or misfortunes of a real person arouse in us can be awakened except through a mental picture of those joys or misfortunes; and the ingenuity of the first novelist lay in his understanding that, as the image was the one essential element in the complicated structure of our emotions, so that simplification of it which consisted in the suppression, pure and simple, of real people would be a decided improvement. A real person, profoundly as we may sympathize with him, is in a great measure perceptible only through our senses, that is to say, remains opaque, presents a dead weight which our sensibilities have not the strength to life. If some misfortune comes to him, it is only in one small section of the complete idea we have of him that we are capable of feeling any emotion; indeed it is only in one small section of feeling any emotion either. The novelist's happy discovery was to think of substituting for those opaque sections, impenetrable to the human soul, their equivalent in immaterial sections, things, that is, which one's soul can assimilate. After which it matters not that the actions, the feelings of this new order of creatures appear to us in the guise of truth, since we have made them our own, since it is in ourselves that they are happening, that they are holding in thrall, as we feverishly turn over the pages of the book, our quickened breath and staring eyes. And once the novelist has brought us to this state, in which, as in all purely mental states, every emotion is multiplied ten-fold, into which his book comes to disturb us as might a dream, but a dream more lucid and more abiding than those of which come to us in sleep, why then, for the space of an hour he sets free within us all the joys and sorrows in the world, a few of which only we should have to spend years of our actual life in getting to know, and the most intense of which would never be revealed to us because the slow course of their development prevents us from perceiving them. It is the same in life; the heart changes, and it is our worst sorrow; but we know it only through reading, through our imagination: in reality its alteration, like that of certain natural phenomena, is so gradual that, even if we are able to distinguish, successively, each of its different states, we are still spared the actual sensation of change.