Verse 3 of Prakaraṇa 2 details the nature of tapas, the austere practice, as defined by the ascetics. The declaration that “consuming the body” represents the supreme form of tapas highlights the transformative power of disciplined self-control, moving beyond superficial mortification of the senses. This isn’t simply about inflicting pain; it’s a deliberate application of effort and restraint designed to purify the prakṛti, the embodied nature of the individual. The phrase “what is obtained by chance, always, is sufficient for the human being” indicates that consistent, unwavering tapas – a practice rooted in conscious effort and self-discipline – yields a greater reward than haphazard or sporadic exertion. This aligns with the broader yogic emphasis on sustained sādhanā to awaken kuṇḍalinī and ultimately realize Brahman.