Summa Theologica - Part I Q74-76: On All the Seven Days in Common - Of the Union of Body and Soul

The Summa Theologica (or the Summa Theologiae or simply the Summa, written 1265–1274) is the most famous work of Thomas Aquinas although it was never finished. It was intended as a manual for beginners as a compilation of all of the main theological teachings of that time. It summarizes the reasonings 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. (Summary adapted from the Wikipedia)

 74. On All the Seven Days in Common

 75. Of Man Who Is Composed of a Spiritual and a Corporeal Substance: and in the First Place, Concerning What Belongs to the Essence of the Soul

 76. Of the Union of Body and Soul