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In page Second Vatican Council:

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Two less solemn statements are attributed to John XXIII about the purpose of the council. One is about opening the windows of the Church to let in some fresh air;[13] the other about shaking off the imperial dust accumulated on the throne of St. Peter. The source for the second statement is Cardinal Léger of Montréal, as reported by Congar.[14] The first statement has been repeated so many times as to be extremely difficult to verify.[citation needed]