The Vincentian Canon (St. Vincent of Lérins)

The Vincentian Canon, written by St Vincent of Lérins in his work entitled Commonitorium , is a threefold test to determine the true Catholicity of a given tradition and to act as a  “A Warning against the Profane Novelties of all Heresies”. The canon is as follows:

“In the Catholic Church we must with all care hold that which has been held in all places, at all times, by all men, for this is truly and properly Catholic.” 

(Hunter, S.J., 1896. Outlines of Dogmatic Theology)

image from the 'Public domain' . St Vincent of Lérins.