"An ACT of the Legislature (for I cannot call it a law) contrary to the great first principles of the social compact, cannot be considered a rightful exercise of legislative authority. The obligation of a law in governments established on express compact, and on republican principles, must be determined by the nature of the power, on which it is founded. A few instances will suffice to explain what I mean. A [***6] law that punished a citizen for an innocent action, or, in other words, for an act, which, when done, was in violation of no existing law; a law that destroys, or impairs, the lawful private contracts of citizens; a law that makes a man a Judge in his own cause; or a law that takes property from A. and gives it to B: It is against all reason and justice, for a people to entrust a Legislature with SUCH powers; and, therefore, it cannot be presumed that they have done it. The genius, the nature, and the spirit, of our State Governments, amount to a prohibition of such acts of legislation; and the general principles of law and reason forbid them. The Legislature may enjoin, permit, forbid, and punish; they may declare new crimes; and establish rules of conduct for all its citizens in future cases; they may command what is right, and prohibit what is wrong; but they cannot change innocence into guilt; or punish innocence as a crime; or violate the right of an antecedent lawful private contract; or the right of private property. To maintain that our Federal, or State, Legislature possesses such powers, if they had not been expressly restrained; would, [*389] in my opinion, be a political [***7] heresy, altogether inadmissible in our free republican governments."