“I know what the word ‘toothache’ means, it produces one particular idea image in my mind”. But what image? – “I can't That can't be explained.” – But if it can't be explained what was the meaning of saying that it produced one particular image? You could say the same about the words “image in your mind”. And all that it comes to is that you are using certain words without an explanation. “But can't I explain them to myself? Or at least understand them myself without giving an explanation? Can't
I give a private explanation? But is this anything you can call an explanation?” Is staring an ˇa private explanation?