Is it that hard to see? Not when you read it in context and read the whole thing. This is from the Council of Trent. First is the definition of justification. All stems from this initial definition. Read for yourself here:
forerunner.com/chalcedon/X0020_15._Council_of_Trent.html
CHAPTER VIII
HOW THE GRATUITOUS JUSTIFICATION OF THE SINNER BY FAITH IS TO BE UNDERSTOOD But when the Apostle says that man is justified by faith and freely,[44] 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[45] 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.[46]
Further
CHAPTER XVI
THE FRUITS OF JUSTIFICATION, THAT IS, THE MERIT OF GOOD WORKS, AND THE NATURE OF THAT MERIT
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.[93] For God is not unjust, that he should forget your work, and the love which you have shown in his name;[94] and, Do not lose your confidence, which hath a great reward.[95] Hence, to those who work well unto the end[96] 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.[97]
For this is the crown of justice which after his fight and course the Apostle declared was laid up for him, to be rendered to him by the just judge, and not only to him, but also to all that love his coming.[98]
For since Christ Jesus Himself, as the head into the members and the vine into the branches,[99] continually infuses strength into those justified, which strength always precedes, accompanies and follows their good works, and without which they could not in any manner be pleasing and meritorious before God, we must believe that nothing further is wanting to those justified to prevent them from being considered to have, by those very works which have been done in God, fully satisfied the divine law according to the state of this life and to have truly merited eternal life, to be obtained in its [due] time, provided they depart [this life] in grace,[100] since Christ our Savior says: If anyone shall drink of the water that I will give him, he shall not thirst forever; but it shall become in him a fountain of water springing up into life everlasting.[101]
Or in the same form you posted, here is canon #1. A Full list can be found here which includes #32 (XXXII)
ic.net/~erasmus/RAZ195.HTM
CANONS CONCERNING JUSTIFICATION
Canon 1. **If anyone says that man can be justified before God by his own works, whether done by his own natural powers or through the teaching of the law,[110] without divine grace through Jesus Christ, let him be anathema. **
Definitions and teachings build upon one another. You cannot understand the 32nd one unless the #1 is taken first and understood. The Catholic church teaches that you cannot **earn **your way to heaven in any way shape or form.