The injunction implies that there are cases in which the father is a good Christian, but he has not succeeded in making his children good Christians. Either they have not become believers at all; or, although nominal Christians, they do not conduct themselves as such. They are profligate, riotous, and disobedient. This implies that the children are old enough to think for themselves and reject the Gospel in spite of their parent's conversion; or that they are old enough to rebel against its authority. And one does not use such strong words as "profligacy" or "riotous living" of quite young children. The prodigal son, of whom the same expression is used, was no mere child. Cases of this kind, therefore, in which the father had been converted to Christianity, but had been unable to make the influences of Christianity tell upon his own children, were common enough to make it worth St. Paul's while to give injunctions about them. And this implies a condition of things in which Christianity was no newly planted religion. The injunctions are intelligible enough. Such fathers are not to be selected by Titus as elders. A man who has so conspicuously failed in bringing his own household into harmony with the Gospel, is not the man to be promoted to rule the household of the Church. Even if his failure is his misfortune rather than his fault, the condition of his own family cannot fail to be a grave impediment to his usefulness as an overseer of the congregation.[72] Thirdly, there is the fact that heresies already exist among the Cretan Christians. Titus, like Timothy, has to contend with teaching of a seriously erroneous kind. From this also we infer that the faith has long since been introduced into the island. The misbeliefs of the newly converted would be spoken of in far gentler terms. They are errors of ignorance, which will disappear as fuller instruction in the truth is received. They are not erroneous doctrines held and propagated in opposition to the truth. These latter require time for their development. From all these considerations, therefore, we conclude that St. Paul is writing to Titus as his delegate in a country in which the Gospel is no new thing. We are not to suppose that the Apostle left Titus in charge of Christians who had been converted a very short time before to the faith.