"What then must the Catholic Christian generally believe?
He must believe all that God has revealed and the Catholic Church proposes to his belief, whether it be contained in Holy Scripture or not."
"Is the Infallibility of the Pope the same as the Infallibility of the Church?
Yes, precisely. The Pope is the Supreme Pastor and Teacher, whose voice all the faithful, clergy and laity, 'lambs and sheep,' are commanded by Christ to hear and to follow. If he could teach error ex cathedra, the Church would then follow him into error, and would thereby fail; and so the promises of Christ would be falsified, which is impossible."
"Application: In matters of faith never trust your own judgment, but always humbly submit to the decisions of Holy Church; for when you believe what the Church teaches, you believe the Word of God."
-A Full Catechism of the Catholic Religion