Derek Mack teaches on the true meaning of grace. While grace is free, it was very costly. He defines cheap grace, highlighting the importance of realizing what we have been given. When we have a true revelation of grace we will live in true freedom! Derek Mack teaches on the true meaning of grace. While grace is free, it was very costly. He defines cheap grace, highlighting the importance of realizing what we have been given. When we have a true revelation of grace we will live in true freedom!