Bhagavatapurana 11.7.39

11.7.39

prāṇa-vṛttyaiva santuṣyen munir naivendriya-priyaiḥ /
jñānaṃ yathā na naśyeta nāvakīryeta vāṅ-manaḥ //

39. Thus a sage should be silent contented with merely supporting his life and never yearn for what gratifies the senses, so that knowledge may not be obscured and the tongue and the mind may not be dissipated on worthless objects.