Kant cautions that we cannot feel or intuit this world of the understanding. He also stresses that we are unable to make interesting positive claims about it because we are not able to experience the world of the understanding. Kant argues that we cannot use the notion of the world of the understanding to explain how freedom is possible or how pure reason could have anything to say about practical matters because we simply do not and cannot have a clear enough grasp of the world of the understanding. The notion of an intelligible world does point us towards the idea of a kingdom of ends, which is a useful and important idea. We just have to be careful not to get carried away and make claims that we are not entitled to.