Boston College will host Cardinal Walter Kasper, Cardinal-Priest of Ognissanti, in Via Appia Nuova and president emeritus of the Pontifical Council for Promoting Christian Unity, on May 1 at 4:30 p.m. in the Heights Room of Corcoran Commons. Cardinal Kasper is the author of the book Mercy: The Essence of the Gospel and the Key to Christian Life (Paulist Press, 2014). He will deliver a lecture on “The Message of Mercy and Its Importance Today.” Co-sponsors: School of Theology and Ministry and The Church in the 21st Century Center.