A person often knows pleasure and pain through direct inner experience, whereas the general concept of justice or a logical relation is articulated intellectually. Neither is an ordinary visible object, yet they are grasped differently.
Inner awareness: “I feel pain” — a state is directly experienced.
Intellectual understanding: “Justice respects each person’s due” — a general meaning or relation is grasped.
This prevents everything nonvisual from being treated as one undifferentiated class. Simile analysis may depend on whether a term is known through sense, inward experience, or abstract thought.