196 Keeping in mind, Venerable Brethren, pontifical norms and decrees, take great care to enlighten and direct the minds and hearts of the artists to whom is given the task today of restoring or rebuilding the many churches which have been ruined or completely destroyed by war. Let them be capable and willing to draw their inspiration from religion to express what is suitable and more in keeping with the requirements of worship. Thus the human arts will shine forth with a wondrous heavenly splendor, and contribute greatly to human civilization, to the salvation of souls and the glory of God. The fine arts are really in conformity with religion when "as noblest handmaids they are at the service of divine worship."
Source: Mediator Dei (Vatican.va)