Lord Ṛṣabhadeva told His sons: My dear boys, of all the living entities who have accepted material bodies in this world, one who has been awarded this human form should not work hard day and night simply for sense gratification, which is available even for dogs and hogs that eat stool. One should engage in penance and austerity to attain the divine position of devotional service. By such activity, one’s heart is purified, and when one attains this position, he attains eternal, blissful life, which is transcendental to material happiness and which continues forever.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ऋषभ उवाच । नायं देहो देहभाजां नृलोके कष्टान् कामानर्हते विड्भुजां ये । तपो दिव्यं पुत्रका येन सत्त्वं शुद्ध्येद्यस्माद्ब्रह्मसौख्यं त्वनन्तम्
ṛṣabha uvāca | nāyaṃ deho dehabhājāṃ nṛloke kaṣṭān kāmānarhate viḍbhujāṃ ye | tapo divyaṃ putrakā yena sattvaṃ śuddhyedyasmādbrahmasaukhyaṃ tvanantam
SB 5.5.1