Frame of Reference and Praxis

An intersection of Physics and Psychology is proposed by Spinoza, for whom the fundamental principle of human behavior--to persist in one's existence--is an application of Newton's First Law.  But, if so, then the human Frame of Reference is fundamentally Practical, i. e. external objects are conditioned by the Frame first and foremost in terms of their usefulness in promoting that principle, as "Ready-to-Hand", rather than as "Present-at-Hand", as Heidegger puts it.  Thus, one shortcoming in Gestalt Psychology is that it does not recognize that the structuring of the world by the mind is governed by Praxis, not by mere Cognition.  Now, Spinoza himself does not develop the Practical implications of his Psychological principle.  But, if he had, he would have discovered a solution to a lingering problem with equating it to a Law of Physics--how to distinguish living from inert entities.  For, the one but not the other has the capacity for Praxis.