The conduct of a prelate[98] ought so far to be superior to the conduct of the people as the life of a shepherd is accustomed to exalt him above the flock. For one whose position is such that the people are called his flock ought anxiously to consider how great a necessity is laid upon him to maintain uprightness. It is necessary, then, that in thought he should be pure, in action firm; discreet in keeping silence, profitable in speech; a near neighbor to every one in sympathy, exalted above all in contemplation; a familiar friend of good livers through humility, unbending against the vices of evil-doers through zeal for righteousness; not relaxing in his care for what is inward by reason of being occupied in outward things, nor neglecting to provide for outward things in his anxiety for what is inward. [Sidenote: Purity of heart essential] The ruler should always be pure in thought, inasmuch as no impurity ought to pollute him who has undertaken the office of wiping away the stains of pollution in the hearts of others also; for the hand that would cleanse from dirt must needs be clean, lest, being itself sordid with clinging mire, it soil all the more whatever it touches. [Sidenote: He must teach by example] The ruler should always be a leader in action, that by his living he may point out the way of life to those who are put under him, and that the flock, which follows the voice and manners of the shepherd, may learn how to walk rather through example than through words. For he who is required by the necessity of his position to _speak_ the highest things is compelled by the same necessity to _do_ the highest things. For that voice more readily penetrates the hearer's heart, which the speaker's life commends, since what he commands by speaking he helps the doing by showing. The ruler should be discreet in keeping silence, profitable in speech; lest he either utter what ought to be suppressed or suppress what he ought to utter. For, as incautious speaking leads into error, so indiscreet silence leaves in error those who might have been instructed. [Sidenote: He must be able to distinguish virtues and vices]