The search for knowledge and truth, especially about the nature of man and his behavior and beliefs (Kernerman English Multilingual Dictionary). The rational and critical inquiry into basic principles (Microsoft Encarta Encyclopedia). The study of the most general and abstract features of the world, the grounds for human knowledge, and the evaluation of human conduct (The Philosophy Pages). If we look at the definitions we can find the most underlying principle of philosophy is questioning. The questioning of what is life? How one should live? What sort of things do exist and what are their natures? What are correct principles of reasoning? What are the principles of reality, knowledge, or values?
Finding the answers or solutions to questions or problems through the application of the principles of reasoning is the aim of philosophy. In short, search for knowledge and truth. The search does not necessarily result in finding the truth. However, the process employed in finding the truth is more important. History tells us that wisdom of humans (the body of knowledge and experience that develops within a specified society or period) changed and has been changing continuously. Humans are in pursuit of wisdom (the ability to think and act using knowledge, experience, understanding, common sense, and insight)