In this way the devotional mystic Mārkaṇḍeya maintained rigid celibacy through penance, study of the Vedas and self-discipline. With his mind thus free of all disturbances, he turned it inward and meditated on the Supreme Personality of Godhead, who lies beyond the material senses.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
इत्थं बृहद्व्रतधरस्तपःस्वाध्यायसंयमैः । दध्यावधोक्षजं योगी ध्वस्तक्लेशान्तरात्मना
itthaṃ bṛhadvratadharastapaḥsvādhyāyasaṃyamaiḥ | dadhyāvadhokṣajaṃ yogī dhvastakleśāntarātmanā
SB 12.8.13