Here is Matthias Grunewald's painting of temptation.
This is a detail from his Visit of St Anthony and St Jerome and the Temptation of St Anthony, some details of the latter follow.
More details follow
More details follow
It always strikes me that every picture of Christ on the cross, which demonstrates the work of the devil, can fall into this category as well. Contributing to the our sense of its beauty is our knowledge of what such a picture is communicating - Christian hope that transcends all our own suffering. This is particularly striking for me in the famous Grunewald crucifixion. As many will know, this was painted for people in a hospital suffering from a fungal infection that people in this part of France incurred by eating rye bread (we now know). The Christ in the painting is bearing the wounds of the passion and the mutilations and sores of the fungal infection. The message is very clear. Take heart, Christ bears all your suffering too.
(Once, again, just to change the focus slightly, notice how the artist has not painted a portrait. The whole person of Christ is emphasises but the facial features are in shadow.)
The quotation from Bonaventure by the way, is from his Commentary on the Four Books of Sentences, I, 31, 2. I found it in Umberto Eco's History of Beauty, Rizzoli, New York. Umberto Eco is an interesting character in that the last I heard he is not a believer, and he does not hold to the view that beauty is an objective quality. Yet his works on aesthetics explain the medieval understanding of beauty and especially the idea of its objectivity as well as any that I know of. The book I refer to is jam packed with quotes from great figures of the Church, which makes it a great resource from lazy and vain bloggers, especially those who have pretensions to scholarship and want to give the impression they are well read without actually doing the reading...like me.