Edited by Douglas M. Beaumont

IGNATIUS PRESS    SAN FRANCISCO

Except where otherwise noted, Scripture citations are from the Revised Standard Version of the Bible, Second Catholic Edition, © 1965, 1966, and 2006 by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. All rights reserved.

Excerpts from the English translation of the Catechism of the Catholic Church, Second Edition, © 1994, 1997, 2000 by Libreria Editrice Vaticana—United States Conference of Catholic Bishops, Washington, D.C. All rights reserved.

Cover art:
The Calling of Andrew and Peter (fresco)
by Giusto di Giovanni de’ Menabuoi
Scrovegni Chapel, Padua, Italy
Photograph © Bridgeman Images

Cover design by John Herreid

© 2016 by Ignatius Press, San Francisco
All rights reserved
ISBN 978-1-62164-042-4 (PB)
ISBN 978-1-68149-650-4 (EB)
Library of Congress Control Number 2015942047
Printed in the United States of America

To the Dumb Ox:
May our speech one day approach the majesty of your silence.

Saint Thomas Aquinas,
pray for us.

In quibus natus sum,
a me rémovens ténebras,
peccátum scílicet et ignorántiam.