Sayings of Adarbad Mahraspandan, as quoted in Rachel MacNair, Religions and Nonviolence (2015), p. 88 https://books.google.it/books?id=KvL3CQAAQBAJ&pg=PA88, adapted from R. C. Zaehner, The Teachings of the Magi (1956), p. 110.
“Men think it right to eat animals, because they are led to believe that God sanctions it. This is untrue. No matter in what books it may be written that it is not sinful to slay animals and to eat them, it is more clearly written in the heart of man than in any books that animals are to be pitied and should not be slain any more than human beings. We all know this if we do not choke the voice of our conscience.”
The Pathway of Life: Teaching Love and Wisdom (posthumous), Part I, International Book Publishing Company, New York, 1919, p. 68
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Leo Tolstoy 456
Russian writer 1828–1910Related quotes
Quoted in The Independent (1992-11-03) following his resignation in September of that year.
Because some of them have no compassion, feeling, or reason, are we to possess no compassion, feeling, or reason?
Remarks on Defences of Flesh-eating; quoted in The Ethics of Diet: A Catena of Authorities Deprecatory of the Practice of Flesh-eating https://archive.org/stream/ethicsofdietcate00will/ethicsofdietcate00will#page/n3/mode/2up by Howard Williams (London: F. Pitman, 1883), p. 193.

The Notebooks of Leonardo da Vinci (1883), XIV Anatomy, Zoology and Physiology