Our Gnostic then alone, having grown old in the Scriptures, and maintaining apostolic and ecclesiastic orthodoxy in doctrines, lives most correctly in accordance with the Gospel, and discovers the proofs, for which he may have made search (sent forth as he is by the Lord), from the law and the prophets. For the life of the Gnostic, in my view, is nothing but deeds and words corresponding to the tradition of the Lord.
Clement of Alexandria
The Stromata, Book VI
Chapter XVI