We aren't lying ˇare speaking the truth if a fact corresponds to the sentence. This is no explanation at all but a mere repetition unless we can supplement it by ‘namely this↗’ & a demonstration & the whole explanation lies just in this demonstration. The whole problem here only arose through the fact that in this case the demonstration is of a different kind, that the demonstration of ‘I see red’, ‘I have t.’ seems indirect to be a demonstration. in a different sense than the term of If I say we must assume an expression which can't lie this can't be explained by saying, that really pain corresponds to this expression.