Śrīmad-Bhāgavatam · Text 11.28.21
Who is speaking and story frame
न यत् पुरस्तादुत यन्न पश्चा-
न्मध्ये च तन्न व्यपदेशमात्रम् ।
भूतं प्रसिद्धं च परेण यद् यत्
तदेव तत् स्यादिति मे मनीषा ॥ २१ ॥
na yat purastād uta yan na paścān
madhye ca tan na vyapadeśa-mātram
bhūtaṁ prasiddhaṁ ca pareṇa yad yat
tad eva tat syād iti me manīṣā
That which did not exist in the past and will not exist in the future also has no existence of its own for the period of its duration, but is only a superficial designation. In My opinion, whatever is created and revealed by something else is ultimately only that other thing.
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.