That sounds like a definition of 'just assumed' by which most things are just assumed. That would be broad to the point of uninterestingness and I wonder if that's what the poster really meant.
ah! but thats the problem - most assumed things are wrong. it is non-trivial to generate a set of assumptions that matches observations with the current technology and with all future technology, with no base from which to derive your new laws.
They have no independent mathematical derivation from some underlying set of first principles.