God established the rainbow as a covenant sign with Noah and all living creatures, promising never to flood the earth again. This visible sign in the sky serves as a divine reminder of God's faithfulness and mercy. The rainbow points beyond itself to God's ultimate act of remembrance—sending Jesus Christ to take our judgment upon Himself. When we see a rainbow, we should trust God's promises, use it for gospel conversations, reclaim its true meaning as a symbol of grace, and appreciate all covenant signs God has given us. The rainbow on earth is only half-visible, but in heaven it forms a complete circle around God's throne, symbolizing the perfect fulfillment of His covenant promises.