In writing to the Galatians, St. Paul reminds the that the law itself is a harsh prison and disciplinarian. To live by that way is to find only death and condemnation. However, to recognize that the law is meant to reveal sin means that they can cling to Christ by faith through baptism. Baptism becomes that foundation upon which we can trust that God is at work in us.
Image: Baptism Shell, posted by WELS.net. No changes made, CC BY-NC 2.0. Image location: https://www.flickr.com/photos/welsnet/3404685668/in/photostream/