A Catholic epistle of the New Testament, presumed to have been written by James, the brother of the Lord, addressed to Jewish Christians who, in accepting Christianity, had not renounced Judaism, and the sphere in which it moves is that of Christian morality, agreeably to the standard of ethics given in the Sermon on the Mount. The author looks upon Judaism as the basis of Christianity, and as on the moral side leading up to it, in correspondence with the attestation of Christ, that "salvation is of the Jews."