As to the eye of the body, objects appear great or small, not so much according to their real dimensions, as according to the nearness or distance of their situation; so do they likewise to what may be called the natural eye of the mind: and we remedy the defects of both these organs pretty much in the same manner. In my present situation an immense landscape of lawns, and woods, and distant mountains, seems to do no more than cover the little window which I write by, and to be out of all proportion less than the chamber in which I am sitting. I can form a just comparison between those great objects and the little objects around me, in no other way, than by transporting myself, at least in fancy, to a different station, from whence I can survey both at nearly equal distances, and thereby form some judgment of their real proportions. Habit and experience have taught me to do this so easily and so readily, that I am scarce sensible that I do it; and a man must be, in some measure, acquainted with the philosophy of vision, before he can be thoroughly convinced, how little those distant objects would appear to the eye, if the imagination, from a knowledge of their real magnitudes, did not swell and dilate them. In the same manner, to the selfish and original passions of human nature, the loss or gain of a very small interest of our own, appears to be of vastly more importance, excites a much more passionate joy or sorrow, a much more ardent desire or aversion, than the greatest concern of another with whom we have no particular connexion. His interests, as long as they are surveyed from this station, can never be put into the balance with our own, can never restrain us from doing whatever may tend to promote our own, how ruinous soever to him. Before we can make any proper comparison of those opposite interests, we must change our position. We must view them, neither from our own place, nor yet from his, neither with our own eyes nor yet with his, but from the place, and with the eyes of a third person, who has no particular connexion with either, and who judges with impartiality between us. Here too, habit and experience have taught us to do this so easily and so readily, that we are scarce sensible that we do it; and it requires, in this case too, some degree of reflection, and even of philosophy to convince us, how little interest we should take in the greatest concerns of our neighbour, how little we should be affected by whatever relates to him, if the sense of propriety and justice did not correct the otherwise natural inequality of our sentiments.