In his book "Practical Thinking", Dr. Edward de Bono talks about the basic thinking processes, how one understands, and the ways to be right or wrong in thinking. He said that the main purpose of thinking is not just to accumulate knowledge but to get enough knowledge in order to act on something. He also said that, in practice, the validity of an idea does not have any bearing in being right in thinking, for being right is a feeling, a belief that one is right during the time of thinking.