This quote courtesy of A.Word.A.Day
    The test of ahimsa is the absence of jealousy. The man whose heart never cherishes even the thought of injury to anyone, who rejoices at the prosperity of even his greatest enemy, that man is the bhakta, he is the yogi, he is the guru of all.
    - Swami Vivekananda (1863-1902)
This concept was/is also important to Jainism.