Digha Nikaya (Coleção dos Discursos Longos) 1:957
SUJATOAtha kho etadeva dukkaratarañceva durabhisambhavatarañca yo saññī samāno jāgaro deve vassante deve gaḷagaḷāyante vijjullatāsu niccharantīsu asaniyā phalantiyā neva passeyya, na pana saddaṁ suṇeyyā”ti.
It’s far harder and more challenging to neither see nor hear a sound as the heavens are raining and pouring, lightning’s flashing, and thunder’s cracking!”