God's grace. God's mercy. A rainbow of promise and love.
The rainbow isn't just colors in the sky, it's a reminder that God keeps His word, shows mercy through every storm, and never forgets His promises. After the flood, God made a covenant with Noah, that He would never destroy the earth by water again. His covenant still stands, unshaken and eternal.
 
Genesis 9:13-17
"I have set my rainbow in the clouds and it shall be a sign of the covenant between me and the earth..."