Calvin on Good Works...

John 5:29. And they who have done good.

"For without the pardon which God grants to those who believe in Him, there never was a man in the world of whom we can say that he has lived well; nor is there even a single work that will be reckoned altogether good, unless God pardon the sins which belong to it, for all are imperfect and corrupted. Those persons, therefore, are here called doers of good works whom Paul calls earnestly desirous or zealous of them, (Titus 2:14.) But this estimate depends on the fatherly kindness of God, who by free grace approves what deserved to be rejected."

Calvin, John. Commentary on John 5:29