Pope John XXIII prayed that the Second Vatican Council would prove to be a new Pentecost. The articles gathered here appeared originally in a series solicited by and published in Theological Studies (September 2012 to March 2014). The purpose of the series was and remains threefold: • To commemorate the 50th anniversary of the Second Vatican Council • To help readers more fully appreciate its significance not only for the Catholic Church itself but also for the entire world whom the Church encounters in proclamation and reception of ongoing revelation • In their present form, to help readers worldwide engage both the conciliar documents themselves and scholarly reflections on them, all with a view to appropriating the reform envisioned by Pope John XXIII. Contributors: Stephen B. Bevans, SVD; Mary C. Boys, SNJM; Maryanne Confoy, RSC; Massimo Faggioli; Anne Hunt; Natalia Imperatori-Lee; Edward Kessler; Gerald O’Collins, SJ; John W. O’Malley, SJ; Agbonkhianmeghe E. Orobator, SJ; Ladislas Orsy, SJ; Peter C. Phan; Gilles Routhier; Ormond Rush; Stephen Schloesser, SJ; Francis A. Sullivan, SJ; O. Ernesto Valiente; Jared Wicks, SJ