"In short, there can be different perspectives, broader or narrower, dealing with particular aspects of people - the biological, psychodynamic, societal, and so on. These perspectives, however are of limited scope and usefulness, although each serves a purpose. Single perspectives do not present the complete view of human beings and do not tell the whole truth about them. Each perspective abstracts certain aspects of the whole person. Each perspective complements one another without exhausting the totality of knowledge about the full meaning of human existence."

“Thomas Kuhn in his book The Structure of Scientific Revolutions divides all scientists into those who create new paradigms of science and those who work within the established paradigms. The same division may be applied to scholars and philosophers, namely into those who create new paradigms and into those who work within the established ones.”

“Grossly oversimplifying, the following models of mind can be discerned in the welter of contemporary psychological theorizing. The first model of the mind is mind as an energy system. This is represented by early psychoanalytical theory, particularly by its dynamic and economic versions. It has also represented by ecologists and by drive reduction theorists. In this model, the stress is on the concept of motivation, conceived as drive. Common to the theories that regard mind as an energy system are the ideas of homeostasis and closed system. The metaphor of energy is often used by motivation theorists who view drives, instincts, and needs as types of forces.”

“The third model regards mind as an information processing system. This is the model of mind subscribed to by cognitive psychologists and also to some extent by the ego psychologists. Since an acquisition of information entails maximization of negative entropy and complexity, this model of mind assumes mind to be an open system.”

“When one turns to psychological models of mental illness, one finds that the psychodynamic model of human mind and of mental disease is also of considerable antiquity. Thus, Empedocles of Agrigentum from whom Hippocrates took the theory of four elements, stressed the importance of emotions of love and hate as the controlling agents of human behavior and of physiological functions.”

“Von Bertalanffy's Ph.D. thesis was on the philosophy of, an epigon of the Philosophy of Nature movement, who was also the founder on psychophysics and experimental esthetics, Fechner, like all the other Philosophers of Nature rejected the reductionist-atomist view of nature. He believed that the universe was a living system existing at a higher level than man. It was governed in addition to the law of causality by the laws of 'stability' and of 'repetition.' These three principles causality, stability and repetition governed biological and psychological phenomena.”

“Another influence of that period was the philosophy of of. Von Bertalanffy met Vaihinger in Vienna and for a time, as a student, lived in his house.10 According to the philosophy of Idealistic Positivism absolute truths and ideal norms of human conduct did not exist, rather man created them as fictions important for the individual and social survival. The idea of relativity of truths and norms postulated by Vainhinger bore a similarity to the relativism of different points of view and categories of thinking postulated by Nicholas of Cusa. The philosophies of Cusanus and Vaihinger were undoubtedly instrumental in shaping von Bertalanffy's 'perspectivist' epistemology and his idea of relativity of categories.”