This document summarizes Dave Roberson's book "Grace Illustrated" which uses the parable of the prodigal son to illustrate the difference between relationship and fellowship with God. The elder brother in the parable based his relationship with his father on works rather than grace, failing to understand that his inheritance and ability to fellowship were given freely. Many Christians today make the same mistake, focusing on religious works over developing fellowship with God. True fellowship comes through understanding that salvation and all blessings are received by God's grace alone.