第8部分(第2/7 頁)

and　sickness；　we　learn　by　bitter　experience　what　an　unspeakable　blessing　it　is　to　be　well。

It　is　therefore　wise　and　necessary　to　learn　in　time；　before　we　have　lost　our　health；　that　it　can　be　kept　only　by　knowing　and　observing　the　laws　of　health。　Nature’s　laws　cannot　be　ignored　with　impunity3。　In　the　long　run　they　will　avenge　themselves　on　us　if　we　forget　them；　even　if　they　do　not　do　so　at　once。　At　first　we　may　not　feel　the　result　of　excesses　and　unhealthy　habits；　but　we　certainly　shall　some　day。　“The　mills　of　God　grind　slowly；　but　they　grind　exceedingly　small。”　Many　a　man　who　in　middle　age　finds　himself　a　confirmed　invalid　has　to　curse　the　follies　of　his　youth：　but　his　remorse　is　vain；　flor　Nature　never　forgives　breaches　of　the　laws　of　health—“physical　sins”；　as　Huxley　called　them。

Loss　of　health　makes　us　miserable；　and　a　burden　to　ourselves　and　our　friends。　It　cripples　our　efforts；　so　that　we　cannot　acplish　many　of　the　good　and　great　things　we　might　have　done。　It　spoils　our　life。　What　must　we　do　to　keep　our　health？

We　must　be　moderate　in　eating　and　drinking；　and　wise　in　the　choice　of　plain；　wholesome4　simple　food。　Cluttony　has　killed　thousands；　and　strong　drink　tens　of　thousands。　We　must；　when　young；　get　plenty　of　sleep。　which　is　“nattlre’s　sweet　restorer”；　and　not　try　to　burn　the　candle　at　both　ends。　We　must　live　as　much　as　possible　in　the　open　air　and　keep　our　rooms　well　ventilated5。　We　must　get　sufficient　and　regular　physical　exercise；　and　keep　our　bo