Church And State: The Teaching Of The Catholic Church On Intervention In Politics" ... The power of the Church is not bound by the limits of 'matters strictly religious', as they say, but the whole matter of the natural law, its foundation, its interpretation, its application, so far as their moral aspects extend, are within the Church's power." Since natural law is those rules of right conduct perceived by the spark of Divine Reason which is in man to guide him to his last end, i.e. eternal bliss with God, then the Church's authority properly covers "all moral activity, which is nearly every aspect of human behaviour ... "