Volume 1 includes the whole of the First Part of the Summa Theologica. Pegis's revision and correction of the English Dominican Translation renders Aquinas' technical terminology consistently as it conveys the directness and simplicity of Aquinas' writing; the Introduction, notes, and index aim at giving the text its proper historical setting, and the reader the means of studying St. Thomas within that setting.

Volume 2 includes substantial selections from the Second Part of the Summa Theologica and the Summa Contra Gentiles. Pegis's revision and correction of the English Dominican Translation renders Aquinas' technical terminology consistently as it conveys the directness and simplicity of Aquinas' writing; the Introduction, notes, and index aim at giving the text its proper historical setting, and the reader the means of studying St. Thomas within that setting.