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As we learned in the Mishna (2a) the High Priest is kept in one of the Temple offices for the week prior to Yom Kippur. Aside from training for the service that he is to perform on the Day of Atonement, this also keeps him away from his house, where there is a possibility that he may become ritually defiled by contact with others.
The sequestration leads us to a discussion of leadership, the public image of the KG and the difference between scholars and Talmidei Chachamim and the critique of Gershom Scholem by Norman Lamm.