Śrīmad-Bhāgavatam · Text 6.4.48
Who is speaking and story frame
मय्यनन्तगुणेऽनन्ते गुणतो गुणविग्रह: ।
यदासीत्तत एवाद्य: स्वयम्भू: समभूदज: ॥ ४८ ॥
mayy ananta-guṇe ’nante
guṇato guṇa-vigrahaḥ
yadāsīt tata evādyaḥ
svayambhūḥ samabhūd ajaḥ
I am the reservoir of unlimited potency, and therefore I am known as unlimited or all-pervading. From My material energy the cosmic manifestation appeared within Me, and in this universal manifestation appeared the chief being, Lord Brahmā, who is your source and is not born of a material mother.
Read Śrīla Prabhupāda's purport on Vedabase.io