In the former sense, a man's land, or merchandize, or money is called his property. In the latter sense, a man has property in his opinions and the free communication of them. He has a property of peculiar value in his religious opinions, and in the profession and practice dictated by them. He has property very dear to him in the safety and liberty of his person. He has an equal property in the free use of his faculties and free choice of the objects on which to employ them. In a word, as a man is said to have a right to his property, he may be equally said to have a property in his rights.
-- James Madison, National Gazette, March 29, 1792.