Śrīmad-Bhāgavatam · Text 2.5.22
Who is speaking and story frame
कालाद् गुणव्यतिकर: परिणाम: स्वभावत: ।
कर्मणो जन्म महत: पुरुषाधिष्ठितादभूत् ॥ २२ ॥
kālād guṇa-vyatikaraḥ
pariṇāmaḥ svabhāvataḥ
karmaṇo janma mahataḥ
puruṣādhiṣṭhitād abhūt
After the incarnation of the first puruṣa [Kāraṇārṇavaśāyī Viṣṇu], the mahat-tattva, or the principles of material creation, take place, and then time is manifested, and in course of time the three qualities appear. Nature means the three qualitative appearances. They transform into activities.
Read Śrīla Prabhupāda's purport on Vedabase.io