Sandro Magister has an article titled "The Pope Theologian Says: The Proof of God Is Beauty" which includes an English translation of the Holy Father's answers to two of the six clergy questions at the cathedral of Brixen, near the vacation place he recently departed. The first of the two questions was about reason and beauty, and the second was about protecting creation.
All 6 questions and the Pope's answers to them have been posted on the Vatican website.
Concerning the need for reason and beauty to go together in the Christian faith, here is part of what the Holy Father said:
"Christian art is a rational form of art – we think of Gothic art, great music, or the Baroque art right here – but this is the artistic expression of a much broader form of reason, in which the heart and reason come together. This is the point. This, I think, is in some way the proof of the truth of Christianity: the heart and reason come together, beauty and truth touch."