... he is a shield to those who take refuge in him.
Add nothing to his words,
lest he reprove you, and you will be exposed as a deceiver.
-- Prv 30:5-9
"Yet this Magisterium is not superior to the Word of God, but is its
servant. It teaches only what has been handed on to it. At the divine command
and with the help of the Holy Spirit, it listens to this devotedly, guards it
with dedication and expounds it faithfully. All that it proposes for belief as
being divinely revealed is drawn from this single deposit of faith."
-- CCC 86