Where, therefore, the gifts of the Lord have been placed, there it behoves us to learn the truth, [namely,] from those who possess that succession of the Church which is from the apostles, and among whom exists that which is sound and blameless in conduct, as well as that which is unadulterated and incorrupt in speech. For these also preserve this faith of ours in one God who created all things; and they increase that love [which we have] for the Son of God, who accomplished such marvelous dispensations for our sake: and they expound the Scriptures to us without danger, neither blaspheming God, nor dishonoring the patriarchs, nor despising the prophets.
Irenaeus of Lyons
Against Heresies, Book IV
Chapter XXVII