There was no rainbow before the מבול as the air was too dense for clouds that would allow light through.
The מבול refined the world so the clouds would allow light through in the form of a rainbow.
The מאמר explains clouds first and then the rainbow:
Clouds come from the earth and reflect the world’s condition.
There are good clouds that are garments for light, including the light of darkness itself and even the light of Teshuva (transforming the darkness)
There are bad clouds that hide the light and represent sin itself.
The clouds are therefore linked to Teshuva, where the bad becomes good, and it shows itself especially in the rainbow which is higher than the cloud itself.
The rainbow is דבר המוקש לי. MP3
