The church does not possess ALL of the Truth.  Truth is not like gold bars hidden away in some vault. 

Nor is Catholicism living in only one period of time.  It is never represented by ONE golden age that has "all the truth."  And the 'sheep' are not to be regarded as simple-minded, 'little people' as Ratzinger called them, but people growing in their understanding of the 'underside' of the church.  

We are in an age that has questions that were not settled in the past, nor in the church's collective memory.  When the entire CHURCH [infallibilitas in credendo]---laity, bishops and pope dialogue together---then the Holy Spirit assists the Church.