Thus disgust is a great reenforcer of social taboo and custom, as well as morality. Just as it fails to keep us from eating the wrong kind of foods, so it may fail to keep us from the wrong conduct. Like every emotion it is only in part adapted to our lives, and in those people where it becomes a prominent emotion it is a great mischief worker, subordinating life to finickiness and hindering the growth of generous feeling. 9. We come to two opposite emotions, very readily considered together. One of the linkings of opposites is in the connection of Joy and Sorrow. Whether these are primary emotions or outgrowths of Pleasure and Pain I leave to others. For Shand the fact that Joy tends to prolong a situation in which it occurs raises it into an active emotion. Joy is perhaps the most energizing of the emotions for it tends to express itself in shouts, smiles and laughter, dancing and leaping. Sorrow ordinarily is quite the reverse and expresses itself by immobility, bowed head and hands that shut out from the view the sights of the world. There is, however, a quiet joy called relief, which is like sailing into a smooth, safe harbor after a tempestuous voyage; and there is an agitated grief, with lamentation, the wringing of hands and self-punishment of a frantic kind. Joy and triumph are closely associated, sorrow and defeat likewise. There are some whose rivalry-competitive feelings are so widespread that they cannot rejoice even at the triumph of a friend, and a little of that nature is in even the noblest of us. There are others who find sorrow in defeat of an enemy, so widespread is their sympathy. This is the generous victor. For the most of us youth is the most joyous period because youth finds in its pleasures a novelty and freshness that tend to disappear with experience. For the same reason the sorrow of youth, though evanescent, is unreasoning and intense.