Misfortunes leave wounds which bleed drop by drop even in sleep; thus little by little they train man by force and dispose him to wisdom in spite of himself. Man must learn to think of himself as a limited and dependent being; and only suffering teaches him this.
In the height of thy prosperity expect adversity, but fear it not. If it come not, thou art the more sweetly possessed of the happiness thou hast, and the more strongly confirmed. If it come, thou art the more gently dispossessed of the happiness thou hadst, and the more firmly prepared.
It is a true observation of ancient writers, that as men are apt to be cast down by adversity, so they are easily satiated with prosperity, and that joy and grief produce the same effects. For whenever men are not obliged by necessity to fight they fight from ambition, which is so powerful a passion in the human breast that however high we reach we are never satisfied.