You gain knowledge for the purpose of gaining the power to get what you want. It is about control. Until you are able to control something, you do not know it fully. The reason why we all want to learn anything is so that we can get what we want. Knowledge is the power to get what we want. Science deals with the study and experiment of natural forces so that we can understand them and then control them and use them. Science reaches its master level when it can control a force. To control is to know.