Book excerpt: The Summa Contra Gentiles, one of Aquinas's best known works after the Summa Theologiae, is a philosophical and theological synthesis that examines what can be known of God both by reason and by divine revelation. A detailed expository account of and commentary on this famous work, Davies's book aims to help readers think about the value of the Summa Contra Gentiles (SCG) for themselves, relating the contents and teachings found in the SCG to those of other works and other thinkers both theological and philosophical. Following a scholarly account of Aquinas's life and his likely intentions in writing the SCG, the volume works systematically through all four books of the text.