This book argues that, though not always recognised as such, Søren Kierkegaard was an important influence on Catholic theologians in the twentieth century, especially those associated with the ressourcement movement which heavily influenced the Second Vatican Council. [Furnal shows how Kierkegaard] not only lent weight to the 'new theology' endorsed by the decrees of Vatican II, but also, we might add, to ecumenical dialogues pursued by ARCIC [Furnal's work] is important, because it re-affirms SK's trans-denominational and trans-confessional significance.