There is also a strong connection between the transpersonal and the humanistic approaches to psychology, as indicated by the sourcebook of Donald Moss. Although transpersonal psychology is considered to have started off within, or developed from humanistic psychology, many of its interests, such as spirituality and modes of consciousness, extend beyond the areas of interest discussed by humanistic theory. According to writers in the field transpersonal psychology advocates for an expanded, spiritual, view of physical and mental health that is not necessarily addressed by humanistic psychology.