A philosophy is a system of beliefs about reality. It is one's integrated view of the world. It includes an understanding of the nature of existence, man, and his role in the world. Philosophy is the foundation of knowledge. It is the standard by which ideas are integrated and understood.
Philosophy is a necessary product of man's rational mind. To live, man must gain knowledge of the world. To understand the world, man must form conclusions about its very nature. For instance, to gain knowledge of particular objects, man must recognize that objects have identity. He must recognize that conclusions are possible because the world does exist, and exists in a particular way.
Philosophy provides the framework for which man can understand the world. It provides the premises by which man can discover truth, and use his mind to support his life. Every man has an understanding of the world. Every man must have a philosophy, even if it is never made explicit.