John Locke, Second Treatise, § 1311689
131. But though Men when they enter into Society, give up the Equality, Liberty, and Executive Power they had in the State of Nature, into the hands of the Society, to be so far disposed of by the Legislative, as the good of the Society shall require; yet it being only with an intention in every one the better to preserve himself his Liberty and Property; (For no rational Creature can be supposed to change his condition with an intention to be worse) the power of the Society, or Legislative constituted by them, can never be suppos'd to extend farther than the common good; but is obliged to secure every ones Property by providing against those three defects above-mentioned, that made the State of Nature so unsafe and uneasie. And so whoever has the Legislative or Supream Power of any Common-wealth, is bound to govern by establish'd standing Laws, promulgated and known to the People, and not by Extemporary Decrees; by indifferent and upright Judges, who are to decide Controversies by those Laws; And to imploy the force of the Community at home, only in the Execution of such Laws, or abroad to prevent or redress Foreign Injuries, and secure the Community from Inroads and Invasion. And all this to be directed to no other end, but the Peace, Safety, and publick good of the People.
The Founders' Constitution
Volume 2, Preamble, Document 1
The University of Chicago Press
Locke, John. Two Treatises of Government. Edited by Peter Laslett. New York: Mentor Books, New American Library, 1965. See also: Montuori
Easy to print version.