The constitution is either a superior paramount law, unchangeable by ordinary means, or it is on a level with ordinary legislative acts, alterable when the legislature shall please to alter it. It is emphatically the province and duty of the judicial department to say what the law is. This is the very essence of judicial duty.
John MarshallWhen a law is in its nature a contract, when absolute rights have vested under that contract, a repeal of the law cannot divest those rights.
John MarshallTo obtain a just compromise, concession must not only mutual-it must be equal also....There can be no hope that either will yield more than it gets in return.
John MarshallThe federal government is acknowledged by all to be one of enumerated powers. The principle, that it can exercise only the powers granted to it . . . is now universally admitted.
John Marshall