In this famous treatise, St. Augustine (AD 354 - 430) covers the question of the role of free will in our lives and how it contrasts with the role of God's grace. He gives scriptural arguments to show that we cannot earn the grace of God, yet this does not deny the role that free will plays in our own salvation.

The work constitutes an exposition of the several clauses of the so-called Apostles’ Creed. The questions concerning the mutual relations of the three Persons in the Godhead are handled with greatest fullness; in connection with which, especially in the use made of the analogies of Being, Knowledge, and Love, and in the cautions thrown in against certain applications of these and other illustrations taken from things of human experience, we come across sentiments which are also repeated in the City of God, the books on the Trinity, and others of his doctrinal writings. The passage ...

This book was written in Latin by Augustine of Hippo (354 - 430) to discuss the Trinity in relation to God the Word (logos). Even though it is not as well known as some of his other writings, it is considered by many to be his masterpiece and of more doctrinal importance than either the Confessions or the City of God. St. Augustine is considered a saint in the Catholic Churches, the Eastern Orthodox Church, and the Anglican Communion. He is ranked among the doctors of the Church in the Roman Catholic Church.

The four books of the Summa contra Gentiles were written by Thomas Aquinas between 1259-1265, before the considerably larger and more influential, Summa Theologica. The purpose of each work was different. Whereas the Summa Theologica addressed the faithful, especially theology students, the intention of the Summa Contra Gentiles (Systematic Exposition Against Non-Christians) was to speak to a non-aligned and even hostile audience. To that purpose, Aquinas presented arguments ‘refuting specific beliefs or heresies.'

In this exposition of 1 Corinthians 13, Jonathan Edwards delves into the crucial Christian discussions of grace, love, and salvation. In doing so, he reveals their natural relations to one another and how living in grace should inevitably lead to living with love. This work does not simply explain the passage, but it also serves as a practical guide of how to live out a life of love.