By Francis Phillips, Catholic Herald - the Hildebrand Project has reissued a slim book of barely 100 pages, written by the theologian Dietrich von Hildebrand in 1968, only a few months after the publication of the encyclical itself. Titled The Encyclical Humanae Vitae: A Sign of Contradiction, and with a new foreword by Catholic scholar Professor Tracey Rowland, it is a highly courageous book to have brought out in the aftermath of Pope Paul’s own reaffirmation of the Church’s constant teaching, but a very necessary one.