Śrīmad-Bhāgavatam · Text 7.15.61
Who is speaking and story frame
स्यात्सादृश्यभ्रमस्तावद्विकल्पे सति वस्तुन: ।
जाग्रत्स्वापौ यथा स्वप्ने तथा विधिनिषेधता ॥ ६१ ॥
syāt sādṛśya-bhramas tāvad
vikalpe sati vastunaḥ
jāgrat-svāpau yathā svapne
tathā vidhi-niṣedhatā
When a substance and its parts are separated, the acceptance of similarity between one and the other is called illusion. While dreaming, one creates a separation between the existences called wakefulness and sleep. It is in such a state of mind that the regulative principles of the scriptures, consisting of injunctions and prohibitions, are recommended.
Read Śrīla Prabhupāda's purport on Vedabase.io