The source itself, the Scripture

One should always be careful to search every teaching from the true source. Namely, even in the sciences about man it is strictly regulated that all the methods and teachings are derived and built from the true principles in a right and careful manner; than they are finally proved by their natural cause, experience and general benefit and usefulness for the people. However, our task here is not to form or compound a certain teaching. We receive it from heaven as already formed and included in the book. It only remains for us to know it well and apply it in our everyday usage. The Son of God Himself, who rests in His lap, has revealed us from there all the secrets. It is exactly to this source and to this wealth that we are referred to by God.

Because some people instruct us to search for the truth sometimes from the old, sometimes from the learned, sometimes from the fathers and the tradition, therefore, it needs to be carefully stressed, as opposed, that Christ and the apostles did not want to list any fathers or their traditions and customs. They could have undoubtedly created them for themselves, and their reputation was of great value to the Pharisees and the priests, as well as with the common people themselves. But, instead, they have not mentioned any of that, not even in the smallest matter, neither for themselves, nor against their opponents. Moreover, they have strictly admonished the traditions of the ancestors. Therefore, all the truth should be exhausted from the source itself, the Scripture. We are built on this unique foundation of the prophets and the apostles. They are the only heads, both of the Church and the faith, and we should rely on the Scripture. Therefore, while emulating them and listening to them, let us not worry too much of what others say or propagate, which instructions or obligations they try to enact upon us or teach us in advance. 

(Matthias Flacius Illyricus, from O načinu razumijevanja Svetoga Pisma. Zagreb, Filozofija. Niz 5. Hrvatska filozofska baština; knj. 1. 1993, p. 93, and possibly translated by Stanko Jambrek).