"an extremely demanding one, fraught with difficulties"

"The inheritance of salvific truth is an extremely demanding one, fraught with difficulties.  Inevitably the Church’s activities, and those of the Supreme Pontiff in particular, often become a 'sign of contradiction'.  This too shows that her mission is that of Christ, who continues to be a sign of contradiction."

     Karol Wojtyła, Sign of contradiction, trans. St Paul Publications (New York:  A Crossroad Book, The Seabury Press, 1979 [1977]), 124.