Śrīmad-Bhāgavatam · Text 3.32.37
Who is speaking and story frame
प्रावोचं भक्तियोगस्य स्वरूपं ते चतुर्विधम् ।
कालस्य चाव्यक्तगतेर्योऽन्तर्धावति जन्तुषु ॥ ३७ ॥
prāvocaṁ bhakti-yogasya
svarūpaṁ te catur-vidham
kālasya cāvyakta-gater
yo ’ntardhāvati jantuṣu
My dear mother, I have explained to you the process of devotional service and its identity in four different social divisions. I have explained to you as well how eternal time is chasing the living entities, although it is imperceptible to them.
Read Śrīla Prabhupāda's purport on Vedabase.io