The Constitution has no inherent authority or obligation. It has no authority or obligation at all, unless as a contract between man and man. And it does not so much as even purport to be a contract between persons now existing. It purports, at most, to be only a contract between persons living eighty years ago. And it can be supposed to have been a contract then only between persons who had already come to years of discretion, so as to be competent to make reasonable and obligatory contracts.