One of the biggest surprises of my research into the doctrine of inseparable operations (DIO) was the discovery of the doctrine of divine missions (DDM). Augustine is the first theologian (I may be wrong here) that unpacks the metaphysics of DDM. After him, DDM becomes replete in the West. It still remains an important locus of Catholic theology.

What makes DDM special? While other traditions also talk about the missions of the Son and the Holy Spirit, in the West DDM has become almost an i