Before we do so, it should be made clear that not every staff constitutes a crosier. For example, archbishops have the privilege of what is called the archiepiscopal or patriarchal cross which may be carried in procession before them. What is it? The archiepiscopal cross is a cross with two horizontal bars; one in addition to the usual one. It can be seen here in the opening of the Holy Door in Santiago de Compostela:
Crosier designs from the 1400's, 1600's and 1700's showing some of the stylistic variations on the ornamentation of the crook |
Receive the staff of Pastoral Office, and in the correction of vice be mercifully severe, exercising judgment without wrath, soothing the souls of thy hearers by encouraging virtue, and in time of tranquillity relaxing not the rule of severity.
Durandus, the medieval liturgist and allegorist, also speaks of how the episcopal staff is a symbol of the doctrinal and disciplinary power of bishops who, like a shepherd, confirms his sheep in the faith and leads back those who have gone astray back into the fold. He further likens it to the rod of Moses as a symbol of their divine commission.