A learned sage should take his satisfaction in the simple maintenance of his existence and should not seek satisfaction through gratifying the material senses. In other words, one should care for the material body in such a way that one’s higher knowledge is not destroyed and so that one’s speech and mind are not deviated from self-realization.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
प्राणवृत्त्यैव सन्तुष्येन्मुनिर्नैवेन्द्रियप्रियैः । ज्ञानं यथा न नश्येत नावकीर्येत वाङ्मनः
prāṇavṛttyaiva santuṣyenmunirnaivendriyapriyaiḥ | jñānaṃ yathā na naśyeta nāvakīryeta vāṅmanaḥ
SB 11.7.39