This text addressed how we know what we are doing morally. It includes a discussion by St. Thomas and other moralists regarding the nature of the object of the moral act, the distinction between a natural and moral species of an act and how one goes from the natural species of an act to the moral species of the act as conceived by reason. The text also includes a detailed discussion of circumstances as well as the fundamental option.
Chad Alec Ripperger, F.S.S.P. is an American Catholic priest, theologian, philosopher and exorcist. He is well known among Traditionalist Catholic circles and has given numerous talks around the country on various religious topics. Many of these are available for viewing on YouTube.