We started by saying that what discriminates living from non-living systems is a sense of purpose. If biology is reducible to quantum physics, and typical quantum objects such as atoms and molecules show no sense of purpose, where does the transition occur? Where does the ‘desire’ to achieve the state of kinetic stability come from? This, of course, brings us back to square one. One easy way out is to conclude that purposefulness is simply an illusion. Pross would probably say that it is an emergent property that arises when chemistry becomes complicated enough. But given that this sense of purposefulness is how we identify life in the first place, perhaps we should resist conclusions that seem to wave it away too easily.
Via aeon magazine