Anthony Winston reviews and describes current perspectives on the aetiology of borderline personality disorder, covering areas such as the role of traumatic factors, attachment theory and self-psychology. The author links these to the psychopathology of the borderline patient who experiences difficulties such as regulation of affect, impulse control and cognitive capacity to both think and reflect. The psychological function of splitting is considered along with other defence mechanisms as having adaptive potential for the borderline patient. Winston describes in a helpful way the links between human development, psychodynamics and psychopathology as he reveals some of the more recent contributions to the field of BPD. At the beginning of his article, he emphasises the problems encountered when attempting to treat or manage patients with BPD. He centres these difficulties on the counter-transference of the clinician, pointing out how such feelings can “all too easily be transformed into therapeutic nihilism”. His article can easily be read as an attempt to counter such a state of mind and he appears to try to generate a more hopeful if not optimistic outlook. In doing so, I fear that he goes beyond his own account of the research evidence for the effectiveness of treatment. Such enthusiasm or optimism can readily be understood as a reactive polar opposite to nihilism or pessimism. I would like to consider further Winston's statements germane to this aspect of his article and raise for further discussion some other ideas which extend beyond the narrower confines of aetiology and psychological therapy.