Very rightly the fine arts are considered to rank among the noblest activities of man's genius, and this applies especially to religious art and to its highest achievement, which is sacred art. These arts, by their very nature, are oriented toward the infinite beauty of God which they attempt in some way to portray by the work of human hands; they achieve their purpose of redounding to God's praise and glory in proportion as they are directed the more exclusively to the single aim of turning men's minds devoutly toward God.
Holy Mother Church has therefore always been the friend of the fine arts and has ever sought their noble help, with the special aim that all things set apart for use in divine worship should be truly worthy, becoming, and beautiful, signs and symbols of the supernatural world, and for this purpose she has trained artists. In fact, the Church has, with good reason, always reserved to herself the right to pass judgment upon the arts, deciding which of the works of artists are in accordance with faith, piety, and cherished traditional laws, and thereby fitted for sacred use.
We, therefore, following the royal pathway and the divinely inspired authority of our Holy Fathers and the traditions of the Catholic Church (for, as we all know, the Holy Spirit indwells her), define with all certitude and accuracy that just as the figure of the precious and life-giving Cross, so also the venerable and holy images, as well in painting and mosaic as of other fit materials, should be set forth in the holy churches of God, and on the sacred vessels and on the vestments and on hangings and in pictures both in houses and by the wayside, to wit, the figure of our Lord God and Savior Jesus Christ, of our spotless Lady, the Mother of God, of the honorable Angels, of all Saints and of all pious people. For by so much more frequently as they are seen in artistic representation, by so much more readily are men lifted up to the memory of their prototypes, and to a longing after them; and to these should be given due salutation and honorable reverence, not indeed that true worship of faith which pertains alone to the divine nature; but to these, as to the figure of the precious and life-giving Cross and to the Book of the Gospels and to the other holy objects, incense and lights may be offered according to ancient pious custom. For the honor which is paid to the image passes on to that which the image represents, and he who reveres the image reveres in it the subject represented.