अशास्त्रविहितं घोरं तप्यन्ते ये तपो जनाः । दम्भाहंकारसंयुक्ताः कामरागबलान्विताः ॥

aśāstra-vihitaṃ ghoraṃ tapyante ye tapo janāḥ | dambhāhaṃkāra-saṃyuktāḥ kāma-rāga-balānvitāḥ ||

Those who practice ghora tapas without śāstric sanction, driven by dambha, ahaṃkāra, kāma and rāga — āsurī tapas.

Word by word (3)
aśāstra-vihitaṃ ghoraṃ tapyante ye tapo janāḥ
— those people (ye janāḥ) who practice (tapyante) terrible/fierce (ghoram) austerity (tapas) not prescribed/enjoined by śāstra (aśāstra-vihitam) — unauthorized extreme self-mortification
dambhāhaṃkāra-saṃyuktāḥ
— combined with (saṃyuktāḥ) hypocrisy (dambha) and egoism (ahaṃkāra) — two āsurī qualities from Ch.16 reappearing as motivations for this distorted tapas
kāma-rāga-balānvitāḥ
— endowed with (anvitāḥ) the power/force (bala) of kāma (desire) and rāga (attachment/passion) — desire and attachment as the hidden energies powering this supposedly ascetic practice

Those who practice terrible austerities not prescribed by scripture, given to hypocrisy and egoism, powered by desire and passion — (these people...V6 continues)

A modern analogy

Someone who fasts publicly, posts about it, and secretly feels superior to those who don't — their 'austerity' is energized by dambha (display) and ahaṃkāra (ego-pride). The body suffers but the ego grows. V5 describes this paradox: the more extreme the outward practice, the more entrenched the inner āsurī drives.

V5-6 form a pair: V5 describes the character motivations of distorted tapas; V6 gives the consequence (torturing elements of the body and the indwelling God). This connects back to Ch.16 V16-18: āsurī people driven by dambha-ahaṃkāra perform rituals corruptly. Here it is tapa that is corrupted. The common thread: genuine virtues (tapas, yajña, dāna) can all be corrupted by wrong guṇa-śraddhā.

Aśāstra-vihita (not prescribed by śāstra) is the key qualifier — it doesn't say 'austerity is bad' but 'unauthorized extreme austerity driven by ego and desire is bad.' Ch.17 V14-19 will lay out what sāttvic tapas looks like: austere but balanced, without violence to the body, dedicated to God, not for social display. The contrast with V5's ghora tapas will be complete.

Public-domain translations (4) compare all →

Those men who practise terrific austerities not enjoined by the scripture, given to hypocrisy and egotism, endued with the strength of lust and passion; [1]

Those men who practise terrific austerities not enjoined by the scriptures, given to hypocrisy and egoism, endued with the strength of lust and passion; [4]

Those men who practise terrific austerities not enjoined by scripture, given to hypocrisy and egoism, endued with strength of desire and passion; [9]

Those people who practice severe ascetic austerities not ordained by the scriptures, are given up to hypocrisy and pride, and endued with desire of attachment and violence. [13]

This verse speaks to

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