Kant: How is the Science of Nature Possible?

"But experience teaches us what exists and how it exists, but never that it must necessarily exist so and not otherwise. Experience therefore can never teach us the nature of things in themselves." (section 14)

Here Kant is saying that experience teaches us everything. It teaches us not only about things, but also where they come from, but in doing this we do not learn from experience is if something absolutely must exist. He says then that experience will never be able to teach us the real origin of things alone. I kind of see where Kant is coming from when he says this. I agree with him that experience does teach us, come the phrase, "The old and the wise". I was a little thrown off when he says that we do not learn if things do really exist because clearly if we learn of them than they at one point had existed. As far as his last statement in this section I do not think that anyone can learn the original origin of anything or anyone unless they are it.