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As now those brute beasts that are accustomed to labor will not, if the reins be let loose, either turn aside or offer to leave the track or stumble in it, so it is with the brutal faculty of the mind; when it is once made tame and manageable by the strength of reason, then it is unwilling carelessly to transgress or saucily to disobey its sovereign’s commands or to comply with any inordinate lusts, either in sleep or sickness; but it carefully observes and maintains its dictates to which it is accustomed, and by frequent exercise advances to perfect strength and intention of virtue.