By rendering devotional service unto the Personality of Godhead, Śrī Kṛṣṇa, one immediately acquires causeless knowledge and detachment from the world.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
वासुदेवे भगवति भक्तियोगः प्रयोजितः । जनयत्याशु वैराग्यं ज्ञानं च यदहैतुकम्
vāsudeve bhagavati bhaktiyogaḥ prayojitaḥ | janayatyāśu vairāgyaṃ jñānaṃ ca yadahaitukam
SB 1.2.7