You must not be under the misimpression that magic is all-powerful. There are limits, and not even the greatest mages may overcome them. No one, for instance, has found any means of traveling--either over great distances or small ones--beyond putting one foot in front of the other. The immutable nature of the physical world prevents this. So no, you may not simply pop over to Minrathous to borrow a cup of sugar, nor may you magic the essay you "forgot" in the apprentice dormitory to your desk. You will simply have to be prepared. --From The Lectures of First Enchanter Wenselus.