ब्रह्मचर्यमहिंसा च शारीरं तप उच्यते।।17.14।।
।।17.14।। देव? द्विज (ब्राह्मण)? गुरु और ज्ञानी जनों का पूजन? शौच? आर्जव (सरलता)? ब्रह्मचर्य और अहिंसा? यह शरीर संबंधी तप कहा जाता है।।
Now in order to explain the three types of austerities incorporated in and corresponding to the three gunas or modes of material nature; Lord Krishna describes their character first as that of bodily austerity, that of verbal austerity and that of mental austerity from each of the three gunas from where tapas manifests. Worship of the Supreme Lord Krishna or any of His authorised incarnations and expansions in their installed deity forms after being duly initiated in the prescribed mantras by the Vaisnava spiritual master, worship of the Vaisnavas and brahmanas, worship of the singular diksa guru the initiating spiritual master and the elevated siksa gurus or instructing spiritual masters. The word saucam means internal and external cleanliness. Arjjavam means no duplicity, the intention of the mind and the action are not different. Brahmacaryam is celibacy the absence of thinking about engaging in sexual relations. Ahimsa is not causing harm to any living entity by thought, word or deed. All these activities constitute austerity of the physical body in sattva guna the mode of goodness.