Śrīmad-Bhāgavatam · Text 8.7.23
Who is speaking and story frame
गुणमय्या स्वशक्त्यास्य सर्गस्थित्यप्ययान्विभो ।
धत्से यदा स्वदृग् भूमन्ब्रह्मविष्णुशिवाभिधाम् ॥ २३ ॥
guṇa-mayyā sva-śaktyāsya
sarga-sthity-apyayān vibho
dhatse yadā sva-dṛg bhūman
brahma-viṣṇu-śivābhidhām
O lord, you are self-effulgent and supreme. You create this material world by your personal energy, and you assume the names Brahmā, Viṣṇu and Maheśvara when you act in creation, maintenance and annihilation.
Read Śrīla Prabhupāda's purport on Vedabase.io