I rather prefer the holistic take that we are our whole selves and not just the part that reflects on what we do or the part that reacts to external and internal material stimuli. We know we can change the instincts, emotions, and hormones when they conflict with what we know by reflection to be just and good. To put it another way, we know that we can do things "without thinking" that are either just or unjust and by reflection can achieve some level of mastery over the direction of our impetuses.