Why do I do what I do? What is my relationship with the law? To a slave, freedom always means the end of whatever is holding him back, whether it is bad (like the prodigal) or good (like the elder brother). But children obey the promise, not the law. They obey because of what they are (sons or daughters who share the Father’s image) and because of what they’re becoming. Their freedom consists in moving within a set of disciplines that they have assigned to them selves that multiply their options and stretch their horizons.
“It was by faith that even Sarah was able to have a child, though she was barren and was too old. She believed that God would keep his promise.” –Hebrews 11:11