This course is intended to introduce the fundamental principles that make up CST following the Second Vatican Council. It builds upon the two previous courses in this sequence, CST 500 and CST 510, by drawing upon the philosophical, anthropological, and theological ideas that have guided the earlier tradition. After having reviewed the main lines of the Council in CST 510, this course gives equal attention to the magisterial teachings in the challenging and dynamic post-Second Vatican Council period under Saint Pope John Paul II, Pope Benedict XVI, and Pope Francis.