This means that the «revelation of the mystery hidden from endless ages» which had taken place in the Incarnation of Christ continues to occur through the «deeds and words» of the Church. (faith.org.uk)
For Adam, the first man, was a type of him who was to come, Christ the Lord, Christ the new Adam, in the very revelation of the mystery of the Father and of his love, fully reveals man to himself and brings to light his most high calling.» (faith.org.uk)
Although they are quite willing to agree that all people are always touched by the mystery that surrounds our existence, they see no need to posit a special and decisive historical revelation of this mystery. (religion-online.org)