SB 10.24.8
sri-nanda uvaca
parjanyo bhagavan indro
meghas tasyatma-murtayah
te ’bhivarsanti bhutanam
prinanam jivanam payah
Translation:
Nanda Maharaja replied: The great Lord Indra is the controller of the rain. The clouds are his personal representatives, and they directly provide rainwater, which gives happiness and sustenance to all creatures.
Purport:
Without clean rainwater, the earth could not possibly provide food or drink for anyone, nor could there be cleanliness. Thus it would be difficult to overestimate the value of rain.