Śrīmad-Bhāgavatam · Text 7.3.11
Who is speaking and story frame
अन्यथेदं विधास्येऽहमयथा पूर्वमोजसा ।
किमन्यै: कालनिर्धूतै: कल्पान्ते वैष्णवादिभि: ॥ ११ ॥
anyathedaṁ vidhāsye ’ham
ayathā pūrvam ojasā
kim anyaiḥ kāla-nirdhūtaiḥ
kalpānte vaiṣṇavādibhiḥ
“By dint of my severe austerities, I shall reverse the results of pious and impious activities. I shall overturn all the established practices within this world. Even Dhruvaloka will be vanquished at the end of the millennium. Therefore, what is the use of it? I shall prefer to remain in the position of Brahmā.”
Read Śrīla Prabhupāda's purport on Vedabase.io