But if he is truthful, why shouldn't we
take his word for it that he sees red? But we do! That's to say we believe that he is not telling us a lie. – But if he is intelligent as well, why shouldn't ˇwe believe that what he has before our his mind's eye is red. We do, – according to the method of comparison applicable in this case. ‘Then where do you disagree with us?’ – When you talk about something incommunicable, private.