The woman who kissed the Lord’s feet was justified by faith

The behavior of “the woman which was a sinner,” when she covered the Lord’s feet with her kisses, bathed them with her tears, wiped them with the hairs of her head, anointed them with ointment, produced an evidence that what she handled was not an empty phantom, but a really solid body, and that her repentance as a sinner deserved forgiveness according to the mind of the Creator, who is accustomed to prefer mercy to sacrifice. But even if the stimulus of her repentance proceeded from her faith, she heard her justification by faith through her repentance pronounced in the words, “Thy faith hath saved thee,” by Him who had declared by Habakkuk, “The just shall live by his faith.”

Tertullian
The Five Books Against Marcion, Book IV
Chapter XVIII

God will judge our works

Now, who is so faultless among men, that God could always have him in His choice, and never be able to reject him? Or who, on the other hand, is so void of any good work, that God could reject him for ever, and never be able to choose him? Show me, then, the man who is always good, and he will not be rejected; show me, too, him who is always evil, and he will never be chosen.  Should, however, the same man, being found on different occasions in the pursuit of both (good and evil) be recompensed in both directions by God, who is both a good and judicial Being, He does not change His judgments through inconstancy or want of foresight, but dispenses reward according to the deserts of each case with a most unwavering and provident decision.

Tertullian
The Five Books Against Marcion, Book II
Chapter XXIII

Salvation can’t be earned

He who has compared human things with divine will require no further arguments on these points. And yet the latter opinion ought to be discussed, that God conferred divine honors in consideration of meritorious claims. Well, then, if the award was made on such grounds, if heaven was opened to men of the primitive age because of their deserts, we must reflect that after that time no one was worthy of such honor; except it be, that there is now no longer such a place for any one to attain to. Let us grant that anciently men may have deserved heaven by reason of their great merits. Then let us consider whether there really was such merit. Let the man who alleges that it did exist declare his own view of merit.  Since the actions of men done in the very infancy of time are a valid claim for their deification, you consistently admitted to the honor the brother and sister who were stained with the sin of incest—Ops and Saturn.

Tertullian
Ad Nationes, Book II
Chapter XIII