Council of Trent, On Justification, Ch. VIII
When the Apostle says that man is justified by faith and freely, these words are to be understood in that sense in which the uninterrupted unanimity of the Catholic Church has held and expressed them, namely, that we are therefore said to be justified by faith, because faith is the beginning of human salvation, the foundation and root of all justification, “without which it is impossible to please God” and to come to the fellowship of His sons; and we are therefore said to be justified gratuitously, because none of those things that precede justification, whether faith or works, merit the grace of justification. For, “if by grace, it is not now by works, otherwise,” as the Apostle says, “grace is no more grace.”
The Council also reiterated the relationship of good works to man justified by faith.
Council of Trent, On Justification, Ch. XVI
Therefore, to men justified in this manner, whether they have preserved uninterruptedly the grace received or recovered it when lost, are to be pointed out the words of the Apostle: “Abound in every good work, knowing that your labor is not in vain in the Lord. For God is not unjust, that he should forget your work, and the love which you have shown in his name”; and “Do not lose confidence, which hath a great reward.” Hence, to those who work well “unto the end” and trust in God, eternal life is to be offered, both as a grace mercifully promised to the sons of God through Christ Jesus, and as a reward promised by God himself, to be faithfully given to their good works and merits.
Beginning of it ey? Then ya gotta get to work and if ya don’t do enough somebody gotta buy ya outa purgatory.