assurance

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]

[Council of Trent