In Summa Theologica - 09 Pars Prima Secundae, Treatise on Law and Grace, Saint Thomas Aquinas presents a comprehensive examination of the relationship between law and grace. This theological work is a profound exploration of the nature of divine grace and its role in the moral life of individuals.

Aquinas delves into the concept of law as a guide for human behavior and the importance of grace in enabling individuals to fulfill their moral obligations. He explores the complexities of how human will interacts with divine grace, uncovering the intricate balance between human agency and divine intervention.

Throughout the treatise, Aquinas provides deep insights into the implications of law and grace for individual morality and the salvation of the soul. His meticulous reasoning and scholarly analysis make this work a valuable resource for theologians, philosophers, and anyone interested in understanding the interplay between divine law and human nature.

Overall, Summa Theologica - 09 Pars Prima Secundae, Treatise on Law and Grace is a thought-provoking and enlightening study of the theological principles that underpin Christian ethics. Aquinas' cogent arguments and nuanced interpretations make this work a must-read for those seeking a deeper understanding of the relationship between law, grace, and moral responsibility.

Book Description:
The Summa Theologica (or the Summa Theologiae or simply the Summa, written 1265–1274) is the most famous work of Thomas Aquinas (c. 1225–1274) although it was never finished. It was intended as a manual for beginners and a compilation of all of the main theological teachings of that time. It summarizes the reasoning for almost all points of Christian theology in the West, which, before the Protestant Reformation, subsisted solely in the Roman Catholic Church. The Summa's topics follow a cycle: the existence of God, God's creation, Man, Man's purpose, Christ, the Sacraments, and back to God. This selection of the Summa Theologica covers questions 90-114 of the Prima Secundae ("First-half of the Second Part"), comprising Treatises on Law (questions 90-108) and Grace (questions 109-114).