Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 15
Sanskrit:
त्वय्यव्ययात्मन् पुरुषे प्रकल्पितालोका: सपाला बहुजीवसङ्कुला: ।यथा जले सञ्जिहते जलौकसो-ऽप्युदुम्बरे वा मशका मनोमये ॥ १५ ॥
ITRANS:
tvayy avyayātman puruṣe prakalpitālokāḥ sa-pālā bahu-jīva-saṅkulāḥyathā jale sañjihate jalaukaso’py udumbare vā maśakā mano-maye
Translation:
All the worlds, with their presiding demigods and teeming populations, originate in You, the inexhaustible Supreme Personality of Godhead. These worlds travel within You, the basis of the mind and senses, just as aquatics swim in the sea or tiny insects burrow within an udumbara fruit.