But whatever may be the cause of sympathy, or however it may be excited, nothing pleases us more than to observe in other men a fellow-feeling with all the emotions of our own breast; nor are we ever so much shocked as by the appearance of the contrary. Those who are fond of deducing all our sentiments from certain refinements of self-love, think themselves at no loss to account, according to their own principles, both for this pleasure and this pain. Man, say they, conscious of his own weakness and of the need which he has for the assistance of others, rejoices whenever he observes that they adopt his own passions, because he is then assured of that assistance; and grieves whenever he observes the contrary, because he is then assured of their opposition. But both the pleasure and the pain are always felt so instantaneously, and often upon such frivolous occasions, that it seems evident that neither of them can be derived from any such self-interested consideration. A man is mortified when, after having endeavored to divert the company, he looks round and sees that no body laughs at his jests but himself. On the contrary, the mirth of the company is highly agreeable to him, and he regards this correspondence of their sentiments with his own as the greatest applause. Neither does his pleasure seem to arise altogether from the additional vivacity which his mirth may receive from sympathy with theirs, nor his pain from the disappointment he meets with when he misses this pleasure; though both the one and the other, no doubt, do in some measure. When we have read a book or poem so often that we can no longer find any amusement in reading it by ourselves, we can still take pleasure in reading it to a companion. To him it has all the graces of novelty; we enter into the surprise and admiration which it naturally excites in him, but which it is no longer capable of exciting in us; we consider all the ideas which it presents rather in the light in which they appear to him, than in that in which they appear to ourselves, and we are amused by sympathy with his amusement which thus enlivens our own. On the contrary, we should be vexed if he did not seem to be entertained with it, and we could no longer take any pleasure in reading it to him. It is the same case here. The mirth of the company, no doubt, enlivens our own mirth, and their silence, no doubt, disappoints us. But though this may contribute both to the pleasure which we derive from the one, and to the pain which we feel from the other, it is by no means the sole cause of either; and this correspondence of the sentiments of others with our own appears to be a cause of pleasure, and the want of it a cause of pain, which cannot be accounted for in this manner. The sympathy, which my friends express with my joy, might, indeed, give me pleasure by enlivening that joy: but that which they express with my grief could give me none, if it served only to enliven that grief.