The modern version of the psychotherapy as a technical matter, has conducted to the psychology, in the field of the clinic and the mental health, has to be required an ethics of the foresight in the action and has to recognize the Emergency of the Principle of the Responsibility, adjusted to the own human circumstances of the therapeutic encounter. In this context the presentation, themselves center in Reflecting on an old and new hypothesis, that of the convergence between the Wisdom and the Technical Knowledge; therefore we present in a succinct way the conceptual dimensions and pragmatists in which they are supported the Psychotherapy systemic to resolve the dilemma. These they are among others the dimensions to show: the vulnerability of the human nature and the Heuristics of the fragility; the distinctions between the technical controls and the to know ecological as base; the morale and the ethics beyond the individual, that is to say the ethics Ecological, and finally the to Know about the Possible like principle generator of the human encounter. The previous analysis attempted to show the vision of a complex, symbolic, and relational Psychology, that attempted to resolve the worries epistemology of the Psychology in the modernity. Key words: systemic therapy, technical knowledge, relational psychology, psychopathology, heuristic, fragility.