Written to give lay Catholics a better understanding of the Eucharist, this book is recognized as a modern spiritual classic. In remarkably clear and straightforward language, it takes the reader step-by-step into the deepest mysteries of the Eucharist — a religiously exhilirating journey into the heart of the Christian faith. Beautifully designed and printed, the Zaccheus Press edition of A Key to the Doctrine of the Eucharist is the first authorized edition to be published in over 50 years. It features a new introduction by Aidan Nichols. The preface is by Peter Kreeft.