For Thomas Aquinas, philosophy was part of the Christian concept of reality, necessary for the exegesis of the Holy Scripture as well as for reflecting on the meaning and the purpose of human existence. This book provides an introduction to his thinking and describes it in the context of the prevailing traditions of his time. Using key questions and their answers in Thomas‹s doctrine as a guideline, the author shows the specific stages of his reasoning, thus facilitating the access to his works. Anyone reflecting on the basic questions of existence will still find Thomas‹s reflections stimulating today.