The German «theologian of hope» Jürgen Moltmann, many decades later, gave grudging recognition of his dependence on these
early pioneers, developing his pivotal The Crucified God (orig., 1972) without explicit indication of the derivative quality of many of his key insights, and only
acknowledging his quoting of Horace Bushnell, in his later The Trinity and the Kingdom (orig, 1980), in footnotes.