Ahimsa..

"By Ahimsa Patanjali meant removal of the desire to kill. This world is inconveniently arranged for a literal practice of ahimsa.  Man may be compelled to exterminate harmful creatures.  He is not under a similar compulsion to feel anger or animosity.  All forms of life have an equal right to the air of maya. The saint who uncovers the secret of creation will be in harmony with Nature's counless bewildering expressions.  All men may understand this truth by overcoming the passion for destruction." -- Sri Yukteswarji,  from Paramahansa Yogananda's Autobiography of a Yogi.