Thus established in the mode of unalloyed goodness, the man whose mind has been enlivened by contact with devotional service to the Lord gains positive scientific knowledge of the Personality of Godhead in the stage of liberation from all material association.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एवं प्रसन्नमनसो भगवद्भक्तियोगतः । भगवत्तत्त्वविज्ञानं मुक्तसङ्गस्य जायते
evaṃ prasannamanaso bhagavadbhaktiyogataḥ | bhagavattattvavijñānaṃ muktasaṅgasya jāyate
SB 1.2.20