Ahimsa

Ahimsa(Non-violence) is one of the essential qualities to access Jnana(Knowledge); the behavior of one who, having achieved by the consent of life, unconsciously refrains from any act or thought that could harm any living being.
Ahiṁsā is the attitude of genuine harmlessness towards other creatures, not just human beings. Of course, a yogi has to know that the human form of life is comparatively more valuable than other species, but he should know as Verses, Translation, and Commentary well that creatures who are in other life forms must fulfill their gratifications there before they could be permanently transformed to higher forms. Their lives should not be underrated. A yogi should not assume a master-of-the-species attitude. He should not harm any other creature willfully. He should situate himself circumstantially so that occasions for killing do not arise.
According to Lord Mahavira and other Tirthankaras in the Jain disciplic succession, we have no business killing other creatures. A yogin should be non-violent. If one finds that he has a violent nature or that a part of his psyche takes pleasure in harming others or in seeing others being hurt, then he should work to purify that part. Each yogin has to realize defects and work to remove them by the relevant yoga kriyās.