QUOTE : Let the first motion be that motion of resistance in matter which is inherent in each several portion of it, and in virtue of which it absolutely refuses to be annihilated. So that no fire, no weight or pressure, no violence, no length of time can reduce any portion of matter, be it ever so small, to nothing, but it will ever be something, and occupy some space; and, to whatever straits it may be brought, will free itself by changing either its form or its place; or if this may not be, will subsist as it is; and will never come to such a pass as to be either nothing or nowhere. This motion the Schoolmen (who almost always name and define things rather by effects and incapacities than by inner causes) either denote by the axiom "two bodies cannot be in one place," or call "the motion to prevent penetration of dimensions." Of this motion it is unnecessary to give examples, as it is inherent in every body.