That in the explanation of appearances one must go to work as though the field of investigation were not cut off by any boundary or beginning of the world; that one must assume the material of the world as it has to be if we are to be taught about it by experience; that no other way of generating occurrences than their determination through unalterable namral laws, and finally that no cause distinct from the world are to be employed: even now these are principles, very correct but little observed, for extending speculative philosophy while finding out the principles of morality independently of alien sources; if only those who demand that we ignore those dogmatic propositions, as long as we are concerned with mere speculation, might not also be accused of trying to deny them.