He Laughs: The Son of Promise Genesis 17:15–27 and Romans 4:13–25 The LORD preaches to Abraham the Son of Promise. 1. Laughter and God’s promised Son. (Genesis 17:15-21) a. It’s good to laugh with wonder at the promise of God – fulfilled in Christ. 2. Grateful obedience and God’s covenant promise. (Genesis 17:22-27) a. It’s good to gratefully obey God’s covenant Word – by faith in Christ. 3. The conviction of faith and justification. (Romans 4:13-25) a. It’s good to believe that God does what He promises – confirmed in Christ.