“Christ Our Lord entrusted the truth which He had brought from heaven to the Apostles, and through them to their successors. He sent His Apostles, as He had been sent by the Father (Jn. 20:21), to teach all nations everything they had heard from Him (cf. Matt. 28:19 f.). The Apostles are, therefore, by divine right the true doctors and teachers in the Church. Besides the lawful successors of the Apostles, namely the Roman Pontiff for the universal Church and Bishops for the faithful entrusted to their care (cf. can. 1326), there are no other teachers divinely constituted in the Church of Christ. But both the Bishops and, first of all, the Supreme Teacher and Vicar of Christ on earth, may associate others with themselves in their work of teacher, and use their advice; they delegate to them the faculty to teach, either by special grant, or by conferring an office to which the faculty is attached (cf. can. 1328). Those who are so called teach not in their own name, nor by reason of their theological knowledge, but by reason of the mandate which they have received from the lawful Teaching Authority. Their faculty always remains subject to that Authority, nor is it ever exercised in its own right or independently.

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As for the laity, it is clear that they can be invited by legitimate teachers and accepted as helpers in the defense of the faith. It is enough to call to mind the thousands of men and women engaged in catechetical work, and other types of lay apostolate, all of which are highly praiseworthy and can be strenuously promoted. But all these lay apostles must be, and remain, under the authority, leadership, and watchfulness of those who by divine institution are set up as teachers of Christ’s Church. In matters involving the salvation of souls, there is no teaching authority in the Church not subject to this authority and vigilance.”