Relative, Personal Righteousness
What [Calvin] is saying is that believers in and of themselves do not possess absolute righteousness; rather, they possess the absolute righteousness of Christ through faith, but abo, as a result of this, a relative form of personal righteousness, which is due to the work of God's Spirit and which is treated by God in the context of covenant grace as worthy of reward.
Steven Coxhead, John Calvin's Subordinate Doctrine of Justification by Works, Westminster Theological Journal, 71 (2009), 11-12