A constitution defines and limits the powers of the government it creates. It therefore follows, as a natural and also a logical result, that the governmental exercise of any power not authorized by the constitution is an assumed power, and therefore illegal.
Thomas PaineIf any generation of men ever possessed the right of dictating the mode by which the world should be governed for ever, it was the first generation that existed; and if that generation did it not, no succeeding generation can show any authority for doing it, nor can set any up.
Thomas Paine