But we should consider that bodies are not objects in themselves that are present to us, but rather a mere appearance of who knows what unknown object; that motion is not the effect of this unknown cause, but merely the appearance of its influence on our senses; that consequently neither of these is something outside us, but both are merely representations in us, hence that it is not the motion of matter that causes representations in us, but that motion itself (hence also the matter that makes itself knowable through it) is a mere representation; and finally that the whole self made difficulty comes to this: