"If reason is to be realized in the sensuous world, it must be possible for many rational beings to live together as such; and this is permanently possible only if each free being makes it its law to limit its own freedom by the conception of the freedom of all others. For each free being having the physical power to check or destroy the freedom of other free beings, and being dependent in its free actions only upon its will; it is only when all free beings have voluntarily made it their law (rule of action) never so to check the freedom of all others that a community of free beings becomes possible, wherein such a check never occurs."