Question: Which author of a 1970 book about Easter is considered one of the most important Roman Catholic theologians of the 20th century?
Sentence (from "Hans Urs von Balthasar"): Hans Urs von Balthasar (12 August 1905 – 26 June 1988) was a Swiss theologian and Catholic priest who was to be created a cardinal of the Catholic Church but died before the ceremony.
Relevant evidence: No