In this important volume one finds the ultimate justification for de Lubac's positions against the atheisms of East and West. The book stands as a gloss on this dictum of Thomas Aquinas: 'In every act of thought and will, God is also thought and willed implicitly.' Although this book provoked much controversy at the time of its original publication, de Lubac insisted that its intention was simply to draw on the double treasure of the philosophia perennis and Christian experience in order 'to lend a helping hand to a few people in their search for God.'