This important essay by the French Catholic philosopher articulates the foundation for his influential interpretations of Thomas Aquinas. Known for his influential writings that brought fresh relevance to the work of Thomas Aquinas, Jacques Maritain was one of the most important Catholic philosophers of the twentieth century. Although An Essay on Christian Philosophy is not generally considered to be among his major works, it is, in a sense, the key to unlocking his massive synthesis of modern Thomism. This provocative essay reveals the inner springs of Maritain's ideas concerning mankind's relationship to God. This lucid translation by Edward H. Flannery includes a glossary of technical terms, making it even more accessible for the general reader.