(3) Health makes morality easier and likelier. The pernicious influence of bodily frailty and abnormality upon mind and morals has always been recognized (cf. the mens sana in corpore sano of the ancients), but was never so clearly seen as today. The lack of proper nutrition or circulation, the state of depressed vitality resulting from want of fresh air, exercise, or sleep, are important factors in the production of insanity and crime. Over fatigue means a weakening of the power of attention, and hence of will, a paralyzing of the highest brain centers, a lowered resistance to the more primitive instincts and passions. Chronic irritability, moroseness, pathological impulses of all sorts, generally betokens eyestrain, dyspepsia, constipation, or some other bodily derangement. With the regaining of normal health the unruly impulses usually become quieter, sympathy flows more freely, the man becomes kinder, more tolerant, and morally sane. Professor Chittenden of Yale is quoted as saying that "lack of proper physical condition is responsible for more moral ... ills than any other factor." Certain temptations, at least, bear more hardly upon the man of weak and unstrung nerves; in Rousseau's well known words, "The weaker the body, the more it commands." And in general, abnormal organic conditions involve a warping of the judgment, a twisted or unbalanced view of life (e.g. Wordsworth's "Spontaneous reason breathed by health"), which leads away from the path of virtue. All honor, then, to the men who have kept clean and true and cheerful through years of bodily depression; such conquest over evil conditions is one of the finest things in life. But nobility of character is hard enough to attain without adding the obstacle of a reluctant body; and although some virtues are easier to the invalid, and some temptations removed from his circumscribed field of activity, it remains true in general that health is the great first aid to morality.