Are we in any doubt as to whether there is such a thing as knowing, or for that matter, sense consciousness, seeing, hearing, touching and so on? I know that there are people in front of me, and each one of you knows, without a doubt, that I am here, looking at you and speaking. I and you know this and many other things besides. If we did not, it would make no sense for me to be speaking here. It goes without saying that you are there, I know it, and you are capable of attending to what I am trying to say, and I know that too.