This volume investigates the nature, order, and effects of charity as the foundational virtue within the Christian moral life. Thomas Aquinas, a 13th-century Dominican friar and Doctor of the Church, utilizes the scholastic method of inquiry to synthesize Aristotelian ethics with Christian revelation. He argues that charity is not merely an emotion but a theological virtue that directs the human will toward God as its ultimate end, thereby informing and perfecting all other virtues.

Scholars and theologians regard this text as a foundational document for understanding medieval moral philosophy and Catholic ethics. Readers frequently note the high density of the scholastic prose, which requires careful study to parse the logical distinctions Aquinas employs.