Sola Scriptura?

"We said above, that it has always been the custom of Catholics, and still is, to prove the true faith in these two ways; first by the authority of the Divine Canon, and next by the tradition of the Catholic Church. Not that the Canon alone does not of itself suffice for every question, but seeing that the more part, interpreting the divine words according to their own persuasion, take up various erroneous opinions, it is therefore necessary that the interpretation of divine Scripture should be ruled according to the one standard of the Church's belief, especially in those articles on which the foundations of all Catholic doctrine rest." 

St. Vincent of Lerins, "Commonitorium"