kant: Metaphysics

Kant says: The distinction between ideas, i.e, pure concepts of reason, from the categories, or pure concepts of the understanding, as cognitions of a quite different species, origin, and use is so important a point founding a science which is to contain the system of all the a priori cognitions that, without this distinction, metaphysics is absolutely impossible or is at best a random, bungling attempt to build a castle in the air without a knowledge of the materials of their fitness for one purpose or another.

I found this quote interesting when Kant talks about ideas. What i get out of what he is saying is that without the a priori cognitions of the ideas you will never know which one will make sense or know the purpose of it. When you see someone write something or say something some ideas can be meant differently from what you think so through a priori it will help you figure the ideas out and how to experience and understand.