8 Hearken then, my beloved, unto that which I write unto you, namely, whatsoever things become solitaries, monks, virgins, saints. Before all things it beseems the man on whom the yoke is laid, that his faith should be firm; as I wrote to you in the first epistle; that he should be zealous in fasting and prayer; that he should be fervent in the love of Christ; and should be humble and mild and wise. And let his speech be peaceful and pleasant, and his thought be sincere with all.
Let him speak his words duly weighing them, and set a barrier to his mouth from harmful words, and let him put far from him hasty laughter. Let him not love the adornment of garments, nor again does it become him to let his hair grow long and adorn it, or to anoint it with sweet-scented ointments. Let him not recline at feastings, nor does it become him to wear gorgeous apparel. Let him not dare to exceed at wine. Let him put far from him proud thoughts. It does not become him to look upon gorgeous apparel, or to wear fine raiment.
Let him put away from him a crafty tongue; let him drive from him envy and wrath, and cast away from him crafty lips. The words that are spoken about a man, when he about whom they are spoken is not near, let him not hear nor receive, that he sin not, until he search them out. Mockery is a hateful fault, and to bring it up upon the heart is not right. Let him not lend and take interest, and let him not love avarice. Let him suffer wrong and not do wrong. Furthermore, let him put away from him turmoil, and words of jesting let him not utter.
Let him not scorn any man who is repenting of his sins, and let him not mock his brother who is fasting, and him that cannot fast let him not put to shame. Where he is received, let him reprove, and where they receive him not, let him understand his own honour. In an acceptable time let him speak his word; otherwise, let him be silent. Let him not for his belly's sake make himself despised by his begging, and to such an one as fears God let him reveal his secret; but let him keep himself from the evil (man).
Let him not speak in complaisance with a wicked man, nor with his enemy. And so let him contend as to have no enemy at all. When men envy him in that which is good, let him add to his goodness, and let him not be harmed because of envy. When he has, and gives to the poor, let him rejoice; and when he has not, let it not grieve him. With a wicked man let him have no converse and with a contemptuous man let him not speak, lest he give himself to contempt. With a blasphemer let him not dispute, lest his Lord be blasphemed on his account.
Let him depart from a slanderer, and let no man please another man with speciousness of words. These things beseem solitaries who take up the heavenly yoke, and become disciples of Christ. For thus it befits the disciples of Christ to be like Christ their Master.
Source: Demonstrations (New Advent)