I am quite sure he had no idea of what you meant." I had expected Poirot to be disappointed; but, to my surprise, he replied that that was as he had thought, and that he was very glad. 
I am certain he had no idea of the meaning of your words.
mnli hypothesis: I am certain he had no idea of the meaning of your words. premise: I am quite sure he had no idea of what you meant." I had expected Poirot to be disappointed; but, to my surprise, he replied that that was as he had thought, and that he was very glad. 