To conclude: a fair measure of work is good for mind as well as body. Man is an intelligence sustained and preserved by bodily organs, and their active exercise is necessary to the enjoyment of health. It is not work, but overwork, that is hurtful; and it is not hard work that is injurious so much as monotonous work, fagging work, hopeless work. All hopeful work is healthful; and to be usefully and hopefully employed is one of the great secrets of happiness. Brain-work, in moderation, is no more wearing than any other kind of work. Duly regulated, it is as promotive of health as bodily exercise; and, where due attention is paid to the physical system, it seems difficult to put more upon a man than he can bear. Merely to eat and drink and sleep one's way idly through life is vastly more injurious. The wear-and-tear of rust is even faster than the tear-and-wear of work. But overwork is always bad economy. It is, in fact, great waste, especially if conjoined with worry. Indeed, worry kills far more than work does. It frets, it excites, it consumes the body--as sand and grit, which occasion excessive friction, wear out the wheels of a machine. Overwork and worry have both to be guarded against. For over-brain-work is strain-work; and it is exhausting and destructive according as it is in excess of nature. And the brain-worker may exhaust and overbalance his mind by excess, just as the athlete may overstrain his muscles and break his back by attempting feats beyond the strength of his physical system. CHAPTER V.--COURAGE. "It is not but the tempest that doth show The seaman's cunning; but the field that tries The captain's courage; and we come to know Best what men are, in their worst jeopardies."--DANIEL. "If thou canst plan a noble deed, And never flag till it succeed, Though in the strife thy heart should bleed, Whatever obstacles control, Thine hour will come--go on, true soul! Thou'lt win the prize, thou'lt reach the goal."--C. MACKAY. "The heroic example of other days is in great part the source of the courage of each generation; and men walk up composedly to the most perilous enterprises, beckoned onwards by the shades of the brave that were."--HELPS. "That which we are, we are, One equal temper of heroic hearts, Made weak by time and fate, but strong in will To strive, to seek, to find, and not to yield."--TENNYSON. THE world owes much to its men and women of courage. We do not mean physical courage, in which man is at least equalled by the bulldog; nor is the bulldog considered the wisest of his species. The courage that displays itself in silent effort and endeavour--that dares to endure all and suffer all for truth and duty--is more truly heroic than the achievements of physical valour, which are rewarded by honours and titles, or by laurels sometimes steeped in blood.