On this theory the devotees of mind-cure cults have derided every hygienic measure but one--their "mind-cure." They sometimes succeed in the "real cure of imaginary ailments," and the "imaginary cure of real ailments." In the latter case, the mental contentment lasts only until the real ailment becomes too aggressive to be ignored. But it is a great mistake to stake everything on the simple resource of mental equanimity. In some cases it is criminal, as for instance to refuse surgery for cancer, or outdoor living for tuberculosis. In its proper place, "mind-cure" is an essential part of individual hygiene. In order to get the benefit of the other rules, there must be no worrying or watching of symptoms. After the regimen of exercise, baths, diet, etc., has been selected, it must be followed as a matter of course, with confidence that it will help, and with patience as to the rate of improvement which will follow. [Sidenote: Worry] It would seem that incessant, even if mild, worry is more exhausting than occasional fits of intense anger or fright or overexcitement, just as we waste more water from a spigot left slightly open all the time than from one which is alternately closed and wide open. Worry, if unceasing, will often drain away the largest store of nervous energy. Worry seems, as it were, to short-circuit nerve currents in the brain, which normally form a long circuit through the body. One man, with this simile before him, has found he can stop worrying almost at will, avoid the supposed continuous short circuit and save up his nervous energy until it is needed. [Sidenote: Rejoice at Things as They Are] We must rejoice at things as they are; they might be worse! If we should count up we should be surprised to find how seldom the things we fear or worry about really happen. It is a true proverb that "half the trouble never comes." [Sidenote: Serenity an Art] Each must learn for himself how best to avoid anger, fear, worry, excitement, hate, envy, jealousy, grief, and all depressing or abnormal mental states. To do so is an art which must be practised, like skating or bicycle-riding. It can not be imparted merely by reading about it. [Sidenote: "One Day at a Time"] When, as unfortunately is often the case, the difficulty of maintaining one's serenity seems insuperable, the battle can often be won by "living one day at a time." Almost any one in ordinary conditions of adversity has it within his or her power, for merely one day or at any rate one hour, or one minute, to eliminate the fear, worry, anger, or other unwholesome emotions clamoring to take possession. At the expiration of say the hour, or minute, the same power can be exercised for the next ensuing period, and so on until one is caught napping, after which he must pick himself up and patiently try again. [Sidenote: The Hurry Habit]