Najera, in his summary, states '… [psychiatrists] should avoid affiliating themselves with philosophical and psychological doctrines which are conducive to psychiatric metaphysics, and adopting personal theories which are not based on facts'. He gives revealing glimpses into the contributions of Cornelius Celsus, Fedele, Boissier de Sauvages, Pinel, Kretschmer, Kleist, Escudero, Jackson, Von Monakow, Goldstein, Gonzalo, and others, and concomitantly emphasizes the need of a critical attitude in evaluating any new scientific work. He concludes that 'the clinician cannot adhere to any determined organic creed but should retain a wide vision of the whole problem, without forgetting the psychological interpretation of the phenomena observed'.