Śrīmad-Bhāgavatam · Text 11.16.39
Who is speaking and story frame
सङ्ख्यानं परमाणूनां कालेन क्रियते मया ।
न तथा मे विभूतीनां सृजतोऽण्डानि कोटिश: ॥ ३९ ॥
saṅkhyānaṁ paramāṇūnāṁ
kālena kriyate mayā
na tathā me vibhūtīnāṁ
sṛjato ’ṇḍāni koṭiśaḥ
Even though over a period of time I might count all the atoms of the universe, I could not count all of My opulences which I manifest within innumerable universes.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.