བསྣུན་ན་ཀླུ་རྣམས་དབང་དུ་འགྱུར་རོ། །
When, wishing to repel hail, one spins a vajra in utter absence of forcefulness while reciting the words at low pitch and in utter secrecy, the nāgas will refrain from sending down hail.
Light, Reality, Assembly