Procession

 Msgr. Pope always does such a great job!

St. Thomas Aquinas speaks poetically of the Trinity in the familiar hymn “Tantum Ergo”:

Genitori, Genitoque … Procedenti ab utroque … compar sit laudautio.
(To the One Who Begets, and to the Begotten One, and to the One who proceeds from them both, be equal praise.)

So, although the Persons of the Trinity are equal, the processions within the Trinity do have an order. The Father is “greater” in the very qualified sense that He is the Principium Deitatis, the Principal of the Deity, but is co-eternal and equal in dignity to the Son and the Holy Spirit.

I am reminded of his post on Perichoresis.