Wittgenstein often made the statement that if you cannot doubt that a thing is so, you cannot know it. For example ( the example he gives) , you cannot know that you are in pain because you cannot doubt it. You cannot say," This pain hurts but I doubt that I feel it." I can understand how when you are in pain you cannot doubt that you are in pain. However, I do not see the leap from that and saying that you cannot know that you are in pain. Why cannot you know something that you cannot doubt? I have read a lot of Wittgenstein and have never found an answer to this. It seems like he just takes it as a given. I thought that maybe it has something to do with the idea that if a statement refers to everything and nothing in particular it is a meaningless statement. Unfortunately, I have failed to make it connect to the idea that you cannot know something that you cannot doubt. Help?