Pope Pius XII in his
address to Italian artists talked of the function of Art. I quote a few paragraphs below.
5. The function of all art lies in fact in breaking through the narrow and tortuous enclosure of the finite, in which man is immerged while living here below, and in providing a window to the infinite for his hungry soul.
6. Thus it follows that any effort—and it would be a vain one, indeed—aimed at denying or suppressing any relation between art and religion must impair art itself. Whatever artistic beauty one may wish to grasp in the world, in nature and in man, in order to express it in sound, in color, or in plays for the masses, such beauty cannot prescind from God. Whatever exists is bound to Him by an essential relationship. Hence, there is not, neither in life nor in art—be it intended as an expression of the subject or as an interpretation of the object—the exclusively "human," the exclusively "natural" or "immanent."
7. The greater the clarity with which art mirrors the infinite, the divine, the greater will be its possibility for success in striving toward its ideal and true, artistic accomplishment. Thus, the more an artist lives religion, the better prepared he will be to speak the language of art, to understand its harmonies, to communicate its emotions.