Kierkegaard, Soren. Purity of heart is to will one thing: spiritual preparation for the feast of confession / by Søren Kierkegaard; translated from the Danish, with an introductory essay by Douglas V. Steere. - Collins: Fontana Books, 1938. - 192 p. Subjects--Topical Terms: Spiritual life. Dewey Class. No.: 248 / KIE