A great many people run down jealousy, on the score that it is an artificial feeling, as well as practically inconvenient. This is scarcely fair; for the feeling on which it merely attends, like an ill-humoured courtier, is itself artificial in exactly the same sense and to the same degree. I suppose what is meant by that objection is that jealousy has not always been a character of man; formed no part of that very modest kit of sentiments with which he is supposed to have begun the world; but waited to make its appearance in better days and among richer natures. And this is equally true of love, and friendship, and love of country, and delight in what they call the beauties of nature, and most other things worth having. Love, in particular, will not endure any historical scrutiny: to all who have fallen across it, it is one of the most incontestable facts in the world; but if you begin to ask what it was in other periods and countries, in Greece, for instance, the strangest doubts begin to spring up, and everything seems so vague and changing that a dream is logical in comparison. Jealousy, at any rate, is one of the consequences of love; you may like it or not, at pleasure; but there it is. It is not exactly jealousy, however, that we feel when we reflect on the past of those we love. A bundle of letters found after years of happy union creates no sense of insecurity in the present; and yet it will pain a man sharply. The two people entertain no vulgar doubt of each other: but this pre-existence of both occurs to the mind as something indelicate. To be altogether right, they should have had twin birth together, at the same moment with the feeling that unites them. Then indeed it would be simple and perfect and without reserve or afterthought. Then they would understand each other with a fulness impossible otherwise. There would be no barrier between them of associations that cannot be imparted. They would be led into none of those comparisons that send the blood back to the heart. And they would know that there had been no time lost, and they had been together as much as was possible. For besides terror for the separation that must follow some time or other in the future, men feel anger, and something like remorse, when they think of that other separation which endured until they met. Some one has written that love makes people believe in immortality, because there seems not to be room enough in life for so great a tenderness, and it is inconceivable that the most masterful of our emotions should have no more than the spare moments of a few years. Indeed, it seems strange; but if we call to mind analogies, we can hardly regard it as impossible.