Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 30

Sanskrit:

अहंतत्त्वाद्विकुर्वाणान्मनो वैकारिकादभूत् ।वैकारिकाश्च ये देवा अर्थाभिव्यञ्जनं यत: ॥ ३० ॥

ITRANS:

ahaṁ-tattvād vikurvāṇānmano vaikārikād abhūtvaikārikāś ca ye devāarthābhivyañjanaṁ yataḥ

Translation:

The false ego is transformed into mind by interaction with the mode of goodness. All the demigods who control the phenomenal world are also products of the same principle, namely the interaction of false ego and the mode of goodness.

Purport:

False ego interacting with the different modes of material nature is the source of all materials in the phenomenal world.