The introduction to the first two limbs of Rāja Yoga, Yama and Niyama, lists the five restraints and five observances which make up the ten ethical principles that operate on every action, word and thought. We begin our study with the first restraint, Ahimsā. Ahimsā, non-harming, appears in the second chapter, Sādhana Pāda, of the Yoga Sūtras …