218. That these ascending and descending degrees, also called prior and subsequent, likewise degrees of height or discrete degrees, are in their power in their outmost degree, may be confirmed by all those things that have been adduced in the preceding chapters as confirmations from objects of sense and perception. Here, however, I choose to confirm them only by the conatus, forces and motions in dead and in living subjects. It is known that conatus does nothing of itself, but acts through forces corresponding to it, thereby producing motion; consequently that conatus is the all in forces, and through forces is the all in motion; and since motion is the outmost degree of conatus, through motion conatus exerts its power. Conatus, force, and motion are no otherwise conjoined than according to degrees of height, conjunction of which is not by continuity, for they are discrete, but by correspondences. For conatus is not force, nor is force motion, but force is produced by conatus, because force is conatus made active, and through force motion is produced; consequently there is no power in conatus alone, nor in force alone, but in motion, which is their product. That this is so may still seem doubtful, because not illustrated by applications to sensible and perceptible things in nature; nevertheless, such is the progression of conatus, force, and motion into power.