Give to every other human being every right that you claim for yourself—that is my doctrine.
Source, in full
Robert Green Ingersoll: "...my religion is simply this: First. Give to every other human being every right that you claim for yourself. Second..." in "The Limitations of Toleration" (The Works of Robert G. Ingersoll, vol. 7, pp. 217-260, quotation on p. 258).