D
Digitonomy
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St. Thomas Aquinas:Exception: The pope. NO POPE, as Bishop of Rome, EVER carried a crozier. If elected to the papacy from another see, he laid the crozier aside.
The Roman Pontiff does not use a pastoral staff because Peter sent his to restore to life a certain disciple who afterwards became bishop of Treves. Hence in the diocese of Treves the Pope carries a crozier but not elsewhere; or else it is a sign of his not having a restricted power denoted by the curve of the staff.