Way back in 1990, when he was going by the nom de guerre Cardinal Ratzinger:
Professors and students suggested, politely, that maybe the Pope should take a pass. (The students hung a sign at lunch "KNOWLEDGE NEEDS NEITHER FATHERS NOR PRIESTS."
Pope Benedict was in charge of Roman Catholic doctrine in 1990 when, as Cardinal Ratzinger, he commented on the 17th-Century Galileo trial.
In the speech, he quoted Austrian-born philosopher Paul Feyerabend as saying the Church's verdict against Galileo had been "rational and just".
Vatican Radio, with all the panache of a "turn blue" rebuttal, came up with this:
Vatican Radio said the protest at La Sapienza had "a censorious tone".