Non-violence leads to the highest ethics, which is the goal of all evolution. Until we stop harming all other living beings, we are still savages.

As quoted in The A-V Magazine Vol. 89, No. 1 (January 1981), p. 18, and The Extended Circle : A Dictionary of Humane Thought (1985) by Jon Wynne-Tyson, p. 75; this has been cited to "Harper's Magazine (1890)" but no occurrence prior to the 1981 appearance has been located.