In spite of that, my Lord, I am praying to You to kindly fulfill my desire. May I please be informed how, in spite of Your transcendental form, You assume the mundane form, although You have no such form at all.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यथाऽऽत्ममायायोगेन नानाशक्त्युपबृंहितम् । विलुम्पन् विसृजन् गृह्णन् बिभ्रदात्मानमात्मना
yathā''tmamāyāyogena nānāśaktyupabṛṃhitam | vilumpan visṛjan gṛhṇan bibhradātmānamātmanā
SB 2.9.26