When, therefore, anyone taketh the name of Abbot he should govern his disciples by a twofold teaching; namely, he should show them all that is good and holy by his deeds more than by his words; explain the commandments of God to intelligent disciples by words, but show the divine precepts to the dull and simple by his works. And let him show by his actions, that whatever he teacheth his disciples as being contrary to the law of God must not be done, "lest perhaps when he hath preached to others, he himself should become a castaway" (1 Cor 9:27), and he himself committing sin, God one day say to him: "Why dost thou declare My justices, and take My covenant in thy mouth? But thou hast hated discipline, and hast cast My words behind thee" (Ps 49:16-17). And: "Thou who sawest the mote in thy brother's eye, hast not seen the beam in thine own" (Mt 7:3).
Image Source: Saint Dunstan's Priory, OSB