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The Court investigated the history of religious freedom in the United States and quoted a letter from Thomas Jefferson in which he wrote that there was a distinction between religious belief and action that flowed from religious belief. The former "lies solely between man and his God," therefore "the legislative powers of the government reach actions only, and not opinions." The court considered that if polygamy was allowed, someone might eventually argue that human sacrifice was a necessary part of their religion, and "to permit this would be to make the professed doctrines of religious belief superior to the law of the land, and in effect to permit every citizen to become a law unto himself." The Court believed the First Amendment forbade Congress from legislating against opinion, but allowed it to legislate against action.