Great as was their devotion to this republican liberty, and ardent as was their love of it, they did not value it too highly. The doctrine that all power resides originally in the people; that they are the source of all law; that their will is to be pronounced by a majority of their numbers, and can know no interruption,--was not first discovered in America. But to this principle of a democracy the people of the American States had added two real and important discoveries of their own. They had ascertained that their own power might be limited by compacts which would regulate and define the modes in which it shall be exercised. Their written constitutions had taken the place of the royal charters which formerly embraced the fundamental conditions of their political existence, but with this essential difference,--that whereas the charter emanated from a foreign sovereign to those who claimed no original authority for themselves, the constitution proceeded from the people, who claimed all authority to be resident in themselves alone. While the charter embraced a compact between the foreign sovereign and his subjects who lived under it, the constitution, framed by the people for their own guidance in exercising their sovereign power, became a compact between themselves and every one of their number. In this substitution of one supreme authority for another, some limitation of the mode in which the sovereign power was to act became the necessary consequence of the change; for as soon as the people had declared and established their own sovereignty, some declaration of the nature of that sovereignty, and some prescribed rules for its exercise, became immediately necessary, and that declaration and those rules became at once a limitation of power, extending to every citizen the protection of every principle involved in them, until the same authority which had established should change them. Against the evils, too, that might arise from the unrestricted control of a majority of the people over the fundamental law,--against the abuse of their power by frequent and passionate changes of the rules which limit its exercise for the time being,--they had discovered the possibility of limiting the mode in which the organic law itself was to be changed. By prescribing certain forms in which the change was to be made, and especially by requiring the fact, that a change had been decreed by those having a right to make it, to be clearly and carefully ascertained by a particular evidence, they guarded the fundamental law itself against usurpation and fraud, and greatly diminished the influences of haste, prejudice, and passion.