Śrīmad-Bhāgavatam · Text 11.6.15
Who is speaking and story frame
अस्यासि हेतुरुदयस्थितिसंयमाना-
मव्यक्तजीवमहतामपि कालमाहु: ।
सोऽयं त्रिणाभिरखिलापचये प्रवृत्त:
कालो गभीररय उत्तमपूरुषस्त्वम् ॥ १५ ॥
asyāsi hetur udaya-sthiti-saṁyamānām
avyakta-jīva-mahatām api kālam āhuḥ
so ’yaṁ tri-ṇābhir akhilāpacaye pravṛttaḥ
kālo gabhīra-raya uttama-pūruṣas tvam
You are the cause of the creation, maintenance and destruction of this universe. As time, You regulate the subtle and manifest states of material nature and control every living being. As the threefold wheel of time You diminish all things by Your imperceptible actions, and thus You are the Supreme Personality of Godhead.
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.