After strong stimulation of a sense we are less able to exercise it than before, as eg in the case of a loud sound we cannot hear easily immediately after, or in the case of a bright colour or a powerful odour we cannot see or smell, but in the case of thought thinking about an object that is highly thinkable renders it more and not less able afterwards to think of objects that are less thinkable: the reason is that while the faculty of sensation is dependent upon the body, thought is separable from it.