“The killing and eating of animals is a prejudice accepted by those who think that animals were given to people by God to eat, so that there is nothing wrong in killing them. This is not true. It may be written in some books that it is not a sin to kill an animal, but it is written in our own hearts more clearly than in any books—that we should take pity on animals in the same way as we do on each other. And we all know this, if we do not deaden the voice of our conscience inside of us.”

Leo Tolstoy, A Calendar of Wisdom (Page 64)