śrī-śuka uvāca
evaḿ sańkīrtitaḥ kṛṣṇo
maghonā bhagavān amum
megha-gambhīrayā vācā
prahasann idam abravīt
sri-sukah uvaca -- Sri Sukadeva Gosvami said; evam -- in this manner; sankirtitah -- glorified; krishnah -- Lord Krishna; maghona -- by Indra; bhagavan -- the Supreme Personality of Godhead; amum -- to him; megha -- like the clouds; gambhiraya -- grave; vaca -- with words; prahasan -- smiling; idam -- the following; abravit -- spoke.
Although in this pastime Lord Krishna appeared to be a small boy, the words megha-gambhiraya vaca indicate that He spoke to Indra with the deep, resonant voice of the Supreme Lord.