The way of perfection passes by way of the Cross. There is no holiness without renunciation and spiritual battle. Spiritual progress entails the ascesis and mortification that gradually lead to living in the peace and joy of the Beatitudes:
He who climbs never stops going from beginning to beginning, through beginnings that have no end. He never stops desiring what he already knows.
-- CCC 2015
(Photo: Image of a 1600-year-old fresco discovered in a Roman catacomb on June 19, 2009 and published by L'Osservatore Romano. It is believed to be the oldest known image of Saint Paul. More on the story here and here. Pope Benedict has also announced that what appear to be bone fragments of the saint have been discovered in his tomb at the Basilica of Saint Paul-Outside-the-Walls in Rome. More on the story here.)
MCITL 10th Anniversary: The Catechism and Scriptures together in the Sunday homily
"The integration of elements of the Catechism of the Catholic Church with the readings from the Lectionary offers us an opportunity to demonstrate how the Word of God is able to animate our personal and communal life with Christ and, at the same time, articulate the Church’s faith that has been immeasurably enriched by the living tradition of twenty centuries."-- Archbishop Donald Wuerl, intervention at the Synod of Bishops on the Word of God