Bhagavatapurana 5.5.1

5.5.1

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/0 ṛṣabha uvāca
nāyaṃ deho deha-bhājāṃ nṛloke kaṣṭān kāmān arhate viḍ-bhujāṃ ye /
tapo divyaṃ putrakā yena sattvaṃ śuddhyed yasmād brahma-saukhyaṃ tv anantam //

1. [In the human world this body of human beings] is not fit to be given to the miserable pleasures which even beasts and birds enjoy; the divine duty of Tapas on the other hand, O sons, is fit for them, by which the mind becomes pure; and from the purity of mind arises the everlasting happiness.