Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 85.
“When a human kills an animal for food, he is neglecting his own hunger for justice. Man prays for mercy, but is unwilling to extend it to others. Why should man then expect mercy from God? It's unfair to expect something that you are not willing to give. It is inconsistent. I can never accept inconsistency or injustice. Even if it comes from God. If there would come a voice from God saying, "I'm against vegetarianism!" I would say, "Well, I am for it!" This is how strongly I feel in this regard.”
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Isaac Bashevis Singer 39
Polish-born Jewish-American author 1902–1991Related quotes

Letter X
The Nemesis of Faith (1849)
Context: I will be candid. I believe God is a just God, rewarding and punishing us exactly as we act well or ill. I believe that such reward and punishment follow necessarily from His will as revealed in natural law, as well as in the Bible. I believe that as the highest justice is the highest mercy, so He is a merciful God. That the guilty should suffer the measure of penalty which their guilt has incurred, is justice. What we call mercy is not the remission of this, but rather the remission of the extremity of the sentence attached to the act, when we find something in the nature of the causes which led to the act which lightens the moral guilt of the agent. That each should have his exact due is Just — is the best for himself. That the consequence of his guilt should he transferred from him to one who is innocent (although that innocent one he himself willing to accept it), whatever else it be, is not justice. We are mocking the word when we call it such. If I am to use the word justice in any sense at all which human feeling attaches to it, then to permit such transfer is but infinitely deepening the wrong, and seconding the first fault by greater injustice. I am speaking only of the doctrine of the atonement in its human aspect, and as we are to learn anything from it of the divine nature or of human duty.

Source: Brideshead Revisited: The Sacred and Profane Memories of Captain Charles Ryder

Source: Why I Am a Vegetarian: An Address Delivered before the Chicago Vegetarian Society (1895), pp. 39–40

though it might conceivably be in some different ones!
Conversations with Economists (1983)
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 272.

World of the Five Gods series, The Curse of Chalion (2000)

In a television interview, ca. 1980. Albert Szent-Gyorgyi discusses religion http://profiles.nlm.nih.gov/ps/retrieve/ResourceMetadata/WGBBMF, National Library of Medicine.