“MEDIEVAL morality was full of the idea that one thing must balance another, that each stood on one side or the other of something that was in the middle, and something remained in the middle. There might be any amount of movement round this central thing; perpetually altering the attitudes, but preserving the balance. The virtues were like children going round the Mulberry Bush, only the Mulberry Bush was that Burning Bush which they made symbolic of the Incarnation; that flamboyant bush in which the Virgin and Child appear in the picture, with Rene of Provénce and his beloved wife kneeling at their sides.”
~G.K. Chesterton: Geoffrey Chaucer.
The Burning Bush (detail of triptych), by Nicolas Froment. Wood, 1476; Cathedrale Saint Sauveur, Aix-en-Provence.