In his second chapter Cook Wilson examines our ordinary use of the word ‘thought’ and its relatives. He finds that we include in thinking certain kinds of knowing, and also certain activities that are not knowing. The kinds of knowing that we call thinking are those that we consider as originative activities of our own. We are probably not very clear about what an originative activity of knowing is. But we feel that in some way inference and comparison, for example, are originative acts, while perception is not. The kinds of thinking that are not knowing are opinion and wonder and perhaps some others. These activities, though not knowledge, appear to be connected with knowledge. To get a clear view of thinking we need to consider the nature of knowledge.