Harry can't make his thoughts disappear, can you make a thought disappear? Can you make all of your thoughts disappear?
Do you think thoughts are more real than things?
Harry thinks about thinking a lot. Is he a philosopher? Who is a philosopher?
Harry says, "If we think about electricity, we can understand it better, but when we think about thinking, we seem to understand ourselves better." Have you ever thought about thinking and then understood yourself better? Have you understood other people better?