“But when we say we have toothache we don't just talk of behaving expressing toothache in this or that way!” – Certainly not, – we express toothache! ‒ ‒ ‒ ‘But you admit that the same expression behaviour may be the expression of toothache pain or may not be that.” – If you imagine a man cheating you always imagine him to use one expression secretely for himself & another for someone else, & this secrecy is not the ‘secrecy of priv. exp.’. ⌊⌊ Cheating is done secretely but this secrecy is not that of the ‘private experience’.⌋⌋ Why shouldn't it be concidered wrong in him to use language in this way.