““303. "I can only believe that someone else is in pain, but I know it if I am."—Yes: one can make the decision to say "I believe he is in pain" instead of "He is in pain". But that is all.——What looks like an explanation here, or like a statement about a mental process, is in truth an exchange of one expression for another which, while we are doing philosophy, seems the more appropriate one. Just try—in a real case—to doubt someone else's fear or pain.””
