Rainbows form when light enters a water droplet, slows down and bends as it goes from air to denser water. The light reflects off the droplet, separating into a spectrum of colors. God’s scientific formula for rainbow formation is impressive. Even greater, it is the symbol of God’s promise to a fallen creation. God put a rainbow in the sky after he destroyed, in a flood, everything (and everyone) corrupted by sin. The rainbow is also a vibrant reminder of God’s ultimate promise—a Savior whose light shattered our darkness.
When we were drowning in guilt, Jesus came into the density of our sin-saturated lives. We deserved to be destroyed, but by shedding his own blood, Jesus dispelled every drop of darkness within us. Our sin is gone, and God sees in us the reflection of Jesus’ light.