Śrīmad-Bhāgavatam · Text 10.87.30
Who is speaking and story frame
अपरिमिता ध्रुवास्तनुभृतो यदि सर्वगता-
स्तर्हि न शास्यतेति नियमो ध्रुव नेतरथा ।
अजनि च यन्मयं तदविमुच्य नियन्तृ भवेत्
सममनुजानतां यदमतं मतदुष्टतया ॥ ३० ॥
aparimitā dhruvās tanu-bhṛto yadi sarva-gatās
tarhi na śāsyateti niyamo dhruva netarathā
ajani ca yan-mayaṁ tad avimucya niyantṛ bhavet
samam anujānatāṁ yad amataṁ mata-duṣṭatayā
If the countless living entities were all-pervading and possessed forms that never changed, You could not possibly be their absolute ruler, O immutable one. But since they are Your localized expansions and their forms are subject to change, You do control them. Indeed, that which supplies the ingredients for the generation of something is necessarily its controller because a product never exists apart from its ingredient cause. It is simply illusion for someone to think that he knows the Supreme Lord, who is equally present in each of His expansions, since whatever knowledge one gains by material means must be imperfect.
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.