The arguments for physical determinism are based on the view that Freedom is incompatible with the fundamental properties of matter, and in particular, with the principle of the conservation of energy. This principle "has been assumed to admit of no exception; there is not an atom either in the nervous system or in the whole of the universe whose position is not determined by the sum of the mechanical actions which the other atoms exert upon it. And the mathematician who knew the position of the molecules or atoms of a human organism at a given moment, as well as the position and motion of all the atoms in the universe, capable of influencing it, could calculate with unfailing certainty the past, present, and future actions of the person to whom this organism belonged, just as one predicts an astronomical phenomenon." [Footnote: Time and Free Will, p. 144 (Fr. p. 110).] Now, it follows that if we admit the universal applicability of such a theory as that of the conservation of energy, we are maintaining that the whole universe is capable of explanation on purely mechanical principles, inherent in the units of which the universe is composed. Hence, the relative position of all units at a given moment, whatever be their nature, strictly determines what their position will be in the succeeding moments, and this mechanistic succession goes on like a Juggernaut car with crushing unrelentlessness, giving rise to a rigid fatalism: "The moving finger writes; and having writ Moves on: nor all thy Piety nor Wit Shall lure it back to cancel half a line, Nor all thy tears wash out a Word of it."