"Patiens quia æterna [patient because eternal] is sometimes said of spiritual authority, and rightly so; not of course that any of the external forms it may assume will be eternal, for every form is only contingent and transitory, but because in itself, in its true essence, it partakes of the eternity and the immutability of the principles; and this is why, in all conflicts that pit temporal power against spiritual authority, one can rest assured that, whatever the appearances may be, it is always the latter that will have the last word."