Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 18

Sanskrit:

अद्यैव त्वद‍ृतेऽस्य किं मम न ते मायात्वमादर्शित-मेकोऽसि प्रथमं ततो व्रजसुहृद्वत्सा: समस्ता अपि ।तावन्तोऽसि चतुर्भुजास्तदखिलै: साकं मयोपासिता-स्तावन्त्येव जगन्त्यभूस्तदमितं ब्रह्माद्वयं शिष्यते ॥ १८ ॥

ITRANS:

adyaiva tvad ṛte ’sya kiṁ mama na te māyātvam ādarśitameko ’si prathamaṁ tato vraja-suhṛd-vatsāḥ samastā apitāvanto ’si catur-bhujās tad akhilaiḥ sākaṁ mayopāsitāstāvanty eva jaganty abhūs tad amitaṁ brahmādvayaṁ śiṣyate

Translation:

Have You not shown me today that both You Yourself and everything within this creation are manifestations of Your inconceivable potency? First You appeared alone, and then You manifested Yourself as all of Vṛndāvana’s calves and cowherd boys, Your friends. Next You appeared as an equal number of four-handed Viṣṇu forms, who were worshiped by all living beings, including me, and after that You appeared as an equal number of complete universes. Finally, You have now returned to Your unlimited form as the Supreme Absolute Truth, one without a second.

Purport:

As stated in the Vedic literature, sarvaṁ khalv idaṁ brahma: everything that exists is an expansion of the Supreme Personality of Godhead. Thus everything is ultimately part and parcel of the Lord’s spiritual existence. By Lord Kṛṣṇa’s causeless mercy, Lord Brahmā personally experienced that all existence, being the potency of God, is nondifferent from Him.