Here He lays to their charge two things; one, that they are unprofitable for the salvation of the many, and need much toil in order to win over even one; another, that they were remiss in the preservation of him whom they had gained, or rather that they were not only careless, but even traitors, by their wickedness in their life corrupting him, and making him worse. For when the disciple sees his teachers to be such as these, he becomes worse than they. For he stops not at his teacher’s wickedness; but as when his teacher is virtuous, he imitates him, so when he is bad, he even goes beyond him, by reason of our proneness to what is evil.