Recorded in 2013. A part of Pope John Paul II’s second chapter is given to raising some important objections and providing adequate responses.  Among the objections that are considered in this lecture are the charges of physicalism/biologism (against the validity of any appeal to “nature” to be a source of moral norms), historicism and cultural relativism (against the claim that natural law is universal), and promissory appeals to future progress (against the claim that natural law is immutable).

https://youtu.be/8tHT8LUyfIs