 Delp's book "In the Face of Death", published in 1956, gathered together his meditations, notes, fragments of his diary and letters, written during his six months imprisonment, and has been compared to Dietrich Bonhoeffer's "Letters and Papers from Prison".It is the first part of a trilogy that includes "Committed to the Earth" and "The Mighty God".The American edition of his "Prison Meditations" (1963) had an introduction by Thomas Merton, who considered him a mystic and among the most insightful writers of his time.