Should it be said that evil results of such kinds are proved to occur only when the pains, bodily or mental, are great, the reply is that in healthy persons the injurious perturbations caused by small pains, though not easily traced, are still produced; and that in those whose vital powers are much reduced by illness, slight physical irritations and trifling moral annoyances, often cause relapses. Quite opposite are the constitutional effects of pleasure. It sometimes, though rarely, happens that in feeble persons intense pleasure--pleasure that is almost pain--gives a nervous shock that is mischievous; but it does not do this in those who are undebilitated by voluntary or enforced submission to actions injurious to the organism. In the normal order, pleasures, great and small, are stimulants to the processes by which life is maintained. Among the sensations may be instanced those produced by bright light. Sunshine is enlivening in comparison with gloom--even a gleam excites a wave of pleasure; and experiments have shown that sunshine raises the rate of respiration: raised respiration being an index of raised vital activities in general. A warmth that is agreeable in degree favors the heart's action, and furthers the various functions to which this is instrumental. Though those who are in full vigor and fitly clothed can maintain their temperature in winter, and can digest additional food to make up for the loss of heat, it is otherwise with the feeble; and, as vigor declines, the beneficence of warmth becomes conspicuous. That benefits accompany the agreeable sensations produced by fresh air, and the agreeable sensations that accompany muscular action after due rest, and the agreeable sensations caused by rest after exertion cannot be questioned. Receipt of these pleasures conduces to the maintenance of the body in fit condition for all the purposes of life.