Why We Believe and The Spirit of Worship (Two Book Bound in One Volume): Twentie By Cristiani, Msgr. Leon Books / Hardcover Religion & Mythology › Other Religion Publisher: Hawthorn Books, January 1959 Price $12.51 Free Shipping Send to a friend Used - Acceptable Acceptable condition. The Library of Catholic Knowledge. Two volumes bound in one. 2nd printing. Front hinge cracked. (Catholicism Catholic) $12.51 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.