We advance by a series of efforts. We gather strength, whether mental or physical, by a succession of strivings in given directions. Exertion, oft repeated, leads to power. It is by obeying this law that the athlete trains himself to accomplish wonderful feats of speed or endurance. When the exertion is along intellectual lines, it leads to unusual talent, or genius; and when in spiritual channels, it leads to wisdom, or transcendent greatness. We should not mourn when circumstances are driving us to greater efforts and more protracted exertion. Events are only evil to the mind that makes them so. They are good to him that accepts their discipline as salutary.