That whose opposite is internally impossible, that whose opposite is clearly also impossible in all respects, is therefore itself absolutely necessary; but I cannot infer conversely that what is absolutely necessary is something whose opposite is internally impossible,.e., that the absolute necessity of a thing is an internal necessity; for this internal necessity is in certain cases a wholly empty ex pression, with which we cannot connect the least concept; on the contrary, the concept of the necessity of a thing in every relation (to everything possible) carries with it very special determinations.