What I have just said also shows why the modifications of the soul cannot be made known through definition; for since we know neither the soul nor its modifications through ideas but only through sensation, and since such sensations as, for example, pleasure, pain, heat, and so on, are not attached to any words, it is clear that if someone had never seen color or felt heat, he could not be made to know these sensations through any definition of them that might be given him.