Śrīmad-Bhāgavatam · Text 11.15.12
Who is speaking and story frame
परमाणुमये चित्तं भूतानां मयि रञ्जयन् ।
कालसूक्ष्मार्थतां योगी लघिमानमवाप्नुयात् ॥ १२ ॥
paramāṇu-maye cittaṁ
bhūtānāṁ mayi rañjayan
kāla-sūkṣmārthatāṁ yogī
laghimānam avāpnuyāt
I exist within everything, and I am therefore the essence of the atomic constituents of material elements. By attaching his mind to Me in this form, the yogī may achieve the perfection called laghimā, by which he realizes the subtle atomic substance of time.
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.