Summa Theologica, Part I-II (pars Prima Secundae): From the Complete American Edition

A philosophical and theological work written in the 13th century. This monumental text is part of a larger body of work that seeks to systematize Christian theology, focusing on the nature of God, morality, and the ultimate purpose of human life. The opening portion introduces foundational concepts of human existence, emphasizing the significance of happiness and the principles that govern human actions. The beginning of the text outlines the main questions that will be addressed regarding human happiness. It posits that the last end of human life is happiness, which drives the inquiry into what constitutes this happiness. Through a series of objections and responses, it explores the nature of human actions, their relation to their intended ends, and whether man inherently acts for a final purpose. This analytical approach sets the stage for a more profound exploration of various attributes of happiness and the moral implications for human behavior, establishing a framework for understanding the divine and ethical order.