St. Thomas Aquinas (c. 1225-1274) is widely viewed as one of the greatest Christian thinkers of all time. Aquinas was the ultimate combination of theologian and philosopher; and his influence on Christian life and thought reaches from the Council of Trent to the Second Vatican Council and through to today. Brian Davies shows that Aquinas's approach to the common questions of faith and existence is just as pressing and significant in our time. Here, the latest scholarship is incorporated with a clear and indispensable guide to Aquinas's thought.