The fundamental truism is the epigrammatic assertion of this distinction.
From this point of view the equation is a mere truism, its real importance resting on the fact that by attributing suitable values to the masses in, and by making simple assumptions as to the value of X in each case, we are able to frame adequate representations of whole classes of phenomena as they actually occur.
It is not the truism it may seem if we reply that we are to find it in the writings of theologians.
Stokes's theorem becomes an obvious truism if applied to an incompressible fluid.
Some reference has already been made to the fact that in every office which Mr Roosevelt held he constantly dwelt upon the truism, often forgotten or ignored, that no government can accomplish any permanent good unless its administrative and legislative officers are chosen and maintained for merit only.