Given that each concept has its genesis in accordance with the development of human society, this paper discusses the problem of defining the content of the concept of security more completely, in the context of security thinking development, through identifying the key elements in some definitions. The identification of these elements provides a more complete understanding of the essence of security, namely it helps in identifying strong and weak points of these definitions. The main objective is to grasp, using this approach based on some theoretical knowledge of social sciences, the possibility of achieving a more complete definition of the content of the concept of security as one of the key issues of further development of basic scientific discipline within the security sciences. The paper covers the period from the origins of the art of war, as a classical approach to security, to the modern universal understanding of security.