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Śrīmad-Bhāgavatam
[Canto 7, Ch. 10]
yam hi na vyathayanty ete puruṣaṁ puruṣarṣabha sama-duḥkha-sukhaṁ dhīraṁ so 'mṛtavāya kalpate
“O best among men [Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation.”
duḥkheṣv anudvigna-manāḥ sukheṣu vigata-spṛhaḥ vīta-rāga-bhaya-krodhaḥ sthita-dhīr munir ucyate
“One who is not disturbed in spite of the threefold miseries, who is not elated when there is happiness, and who is free from attachment, fear and anger, is called a sage of steady mind.” A devotee should not be aggrieved in an awkward position, nor should he feel extraordinarily happy in material opulence. This is the way of expert management of material life. Because a devotee knows how to manage expertly, he is called  jīvan-mukta . As Rūpa Gosvāmī explains in  Bhakti-rasāmṛta-sindhu :
īhā yasya harer dāsye karmaṇā manasā girā nikhilāsv apy avasthāsu jīvan-muktaḥ sa ucyate
“A person acting in Kṛṣṇa consciousness (or, in other words, in the service of Kṛṣṇa) with his body, mind, intelligence and words is a liberated person even within this material world, although he may be engaged in many so-called material activities.” Because of constantly engaging in devotional service, in any condition of life, a devotee is free from all material bondage.
bhaktiḥ punāti man-niṣṭhā śva-pākān api sambhavāt
“Even one born in a family of meat-eaters is purified if he engages in devotional service.” ( Bhāg.  11.14.21) Śrīla Jīva Gosvāmī cites this verse