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.

p 338-339. as cited in: "Mental Illness and Mouse Traps" by David L. Gilles-Thomas, 1989, at ccvillage.buffalo.edu. (Full program) - Models of Mental Illness (1984)