Thomas Aquinas's doctrine of duplex beatitudo is problematic for theologians who want to read his conception of human nature as integrally ordered to the visio divina. The doctrine seems rather to support a duplex ordo– a tidy parallelism of existent human ‘ends’, one discretely ‘natural’ and the other discretely ‘supernatural’. Is this in fact the case? Does the doctrine of duplex beatitudo commit the theologian to a bifurcated anthropology? Or is it possible to reconcile the doctrine with a more paradoxical anthropology which understands the human being as naturally ordered to a supernatural end that nevertheless exceeds the attainable power of human nature? This article offers a christological reading of the doctrine of duplex beatitudo. The article proposes a tensive distinction in unity of the twofold beatitude according to the Chalcedon paradox: inconfuse, immutabiliter, indivise, inseparabiliter.