Thomas Aquinas

“ Therefore, no matter how good a work may be, if it be done without charity, it does not give man a claim to receive anything from God. On the other hand, an evil deed deserves an equivalent punishment according to the measure of its malice, because no evil has been done to us on the part of God, like the good which He has done. Therefore, although an evil deed deserves condign punishment, nevertheless a good deed without charity does not merit condign reward. ”

“ Baptism imprints a character on the soul, whereas satisfaction does not. Hence on the advent of charity, which removes both insincerity and sin, it causes Baptism to have its effect, whereas it does not do this for satisfaction. Moreover Baptism confers justification in virtue of the deed [ex opere operato] which is not man's deed but God's, wherefore it does not become a lifeless deed as satisfaction does, which is a deed of man. ”

“ Or we may say that the greater the contrition the more it alleviates the punishment, and the more good actions a man does while in sin, the more he disposes himself to the grace of contrition, so that it is probable that he owes a smaller debt of punishment. For this reason the priest should use discretion in taking them into account, so as to give him a lighter penance, according as he finds him better disposed. ”

“ Further, charity does not quicken a work, unless in some way that work proceeds therefrom. But works cannot be acceptable to God, and therefore cannot be satisfactory, unless they be quickened by charity. Since then the works done without charity, in no way proceeded from charity, nor ever can proceed therefrom, they can by no means count towards satisfaction.
I answer that, Some have said that works done while in a state of charity, which are called living works, are meritorious in respect of eternal life, and satisfactory in respect of paying off the debt of punishment ”

“ I answer that, Some have said that if, when all a man's sins have been pardoned through contrition, and before he has made satisfaction for them, he falls into sin, and then makes satisfaction, such satisfaction will be valid, so that if he die in that sin, he will not be punished in hell for the other sins. ”

“ Further, it is a greater thing to do a good deed than to omit an evil deed. But the omission of an evil deed always avoids a punishment, even in one who lacks charity. Much more, therefore, do good deeds void punishment. ”

“ As the Philosopher states (Ethic. viii, 14) , since no matter what a son may do, he can never give back to his father the equal of what he has received from him a father can never become his son's debtor: and much less can man make God his debtor on account of equivalence of work. Consequently no work of ours can merit a reward by reason of its measure of goodness, but it can by reason of charity, which makes friends hold their possessions in common. ”

“ As sins are not connected together in some single one, a man can incur one without incurring another; whereas all sins are remitted by reason of one same thing, so that the remissions of various sins are connected together. Consequently satisfaction cannot be made for one and not for another. ”