There is, however, more to making something part of the magisterium, and therefore binding on the consciences of Catholics, than simply asserting that it is magisterial. The content of the document is also relevant. ‘Legal positivists’ claim that laws are valid just by virtue of a valid procedure approving them, but this is false and has never been accepted by the Church. Even in the case of human laws, a law will fail to bind in conscience if it is impossible to follow, for example if it is incomprehensible, retroactive, or totally unreasonable.