Double procession refers to how the Spirit relates to the Father and Son. It is said to be “double” because both the Father and the Son spirate (breathe out) the Spirit. The Spirit comes from both. Others find it better to say: the Spirit only proceeds from the Father in order to maintain the monarchy of the Father.
While both positions overlap, it is worthwhile to consider the logic of double procession since few discuss the relative (pun-intended) benefits of the doctrine today. The basic argument is that double procession ensures that each person in God has one relational difference from the other. The point is to ensure that we can distinguish the Father, Son, and Spirit.
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