…faith involves both a renunciation and a reliance. First, we must renounce any trust in our own performance as the basis of our acceptance before God. We trust in our own performance when we believe we’ve earned God’s acceptance by our good works. But we also trust in our own performance when we believe we’ve lost God’s acceptance by our bad works-by our sin. So we must renounce any consideration of either our bad works or our good works as the means of relating to God.
Second, we must place our reliance entirely on the perfect obedience and sin-bearing death of Christ as the sole basis of our standing before God-on our best days as well as our worst.
-Jerry Bridges, The Bookends of the Christian Life