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The action that is the cause of the separation of the soul from the body, which is the collection of the five senses, is violence. The absence of this is non-violence. Truthfulness of mind and speech is truth. Stealing the property of others is theft, the absence of which is non-stealing. Restraint of the senses is celibacy. Renunciation of possessions and attachments is non-possession, non-attachment. These five vows, being unlimited and undemarcated by direction, time, caste, etc., are universal and absolute, and are called "mahavrata".
How are these yamas considered limbs of yoga? Because violence, etc., are the opposite of the eight limbs of yoga, and these are restrained by the feeling of their opposites, non-violence, etc. That is, non-violence, etc., do not allow violence, etc., to arise, or if they arise, they destroy them. How is this restraint done by non-violence, etc.? Violence, etc., are restrained, so there is ease in attaining the materials of yoga, i.e., it produces a purity of mind that makes it easy to attain the materials of yoga. Thus, indirectly, there is restraint by non-violence, etc., but it is not directly a limb of yoga, like the direct benefit of concentration, etc.
These twenty-seven types of violence are: by body, by speech, by mind; done, caused, approved; and mild, moderate, and extreme - thus, by mutual combination, there are twenty-seven types of violence (3x3x3=27). By contemplating the infinite consequences of these twenty-seven types of violence, which are suffering and ignorance, the yamas of non-violence, etc., become superior, excellent, and refined. And the fruit of such refined non-violence, etc., is described as follows: In the presence of those who practice non-violence, there is an abandonment of hatred, and an abandonment of the killing of snakes, worms, etc., which are naturally hostile and born to kill. (Yoga Sutra 2.33, etc.). Thus, Patanjali has considered non-violence, etc., according to the Yoga Sutras.
x "Unlimited, universal, great vow" - Patanjali Yoga Sutra 2.3. + "Abandonment of violence" - Patanjali Yoga Sutra 2.33, etc. "Restraining the arguments by the feeling of their opposite." - Sri Yashvijayaji's commentary on the Yoga Sutras, 2.3. * "Truthfulness is the foundation of action and its fruits. Non-stealing is the foundation of the possession of all treasures. Celibacy is the foundation of the attainment of the highest state." - Patanjali Yoga Sutra 2.36-39. "Abandonment of hatred in the presence of him, and the fruit of his action is not done." - Sri Yashvijayaji's commentary on the Yoga Sutras, 2.25.