[The basic constant of philosophy] consists in the necessity of taking one or the other of the alternatives: Does man create reality by having ideas about it, or do ideas depend on man's registering reality? Moreover, since reality is registered primarily through the registering of the size, the magnitude, or quantity of a thing, does it follow that the reality of a thing is exhausted by its quantitative parameters?
In fact, it seems to me that these choices are so fundamental that it is not possible to work out a consistent system of philosophy without adopting one or the other of those alternatives. Of course, only if one takes the realist alternative, is it possible to work out a philosophical system which can be communicated by a real means, such as a book. Although physical things reveal their reality primarily through their quantitative size, a set of quantitative measures is never equivalent to physical reality, let alone the source of it. If, however, such is the case, the exactness of quantities will never become an arbiter over ontological questions such as causality, freedom, and purpose.
[Numbers Decide: Planck's Constant and the Constants of Philosophy, Numbers Decide and Other Essays, p. 18-19]
~ Jakian Thomist