To use another metaphor, a relationship must often go through some deep surgery to get better. Think of surgery without commitment! What if the patient decides in the middle of a heart bypass to get off the table? He would die before the operation that could have saved his life is finished. In marriage, God often wants to do surgery that would save the life of the relationship, but the patient jumps off the table before the surgery is complete. Commitment keeps the patient on the table until the surgery is finished.
