Kerygma and Dogma by Karl Rahner (with Karl Lehmann) is a significant 1969 book exploring the relationship between the initial proclamation of the Gospel (kerygma) and the formal, developed doctrines (dogmas) of the Church, emphasizing how the latter emerges from the former through historical development, a core concept in Rahner's theological work on the development of dogma to reconcile tradition with modern understanding. The book highlights that dogma isn't static but grows from the core Christian message, aiming to make faith accessible while respecting historical continuity, though some critics question if Rahner's justifications are ex post facto rationalizations for existing Church teachings.