You have to be careful, for the teachings of the Council do not constitute a complete, organic system of Catholic doctrine. Doctrine is much more extensive, as everyone knows, and it wasn’t called into question by the Council nor substantially modified. Instead, the Council confirms, illustrates, defends, and develops it with a most authoritative apologia full of wisdom, vigor and confidence. And it is the Council’s doctrinal aspect that we have to consider first in order to pay honor to the word of God, which remains univocal and lasting like a light that doesn’t fail, and in order to strengthen our souls. From the Council’s solemn and open voice they learn what a providential office Christ entrusted to the living magisterium of the Church in order to preserve, defend, and interpret the “deposit of faith.” (cf. Humani generis, A.A.S. 42, 1950, p. 567)