St. Augustine’s work is great, but difficult to find a translation easy to read. The tendency to be formulaic to the point of unsatisfying exactitude makes this subject a difficult one to convey. After all, we are dealing with the Creator Who undertook to purchase all human flesh at the expense of His Only-Begotten Son, Whose name is preached among us by the Holy Spirit so that we may live and abide in Him forever.
This is a great book, unfortunately out of print and now only with exorbitantly priced used copies. I don’t know why they haven’t made an audiobook or Kindle edition. Someone should!
I always remember a quote from some Paul Tournier book (can’t remember who he cited though):
“Whatever your arguments about The Father, The Son and The Holy Spirit are...leave them. Just make sure They are in you.”
Of course it's ultimately a mystery; created intellect cannot perfectly grasp or fully understand the relationships within the Godhead.
How about The Good Book?! Were I tackling your ambitious project, I would begin by collecting every Bible reference, explicit and implicit.
Perhaps White does that--I can't imagine writing or teaching on that subject without it (indeed, if he doesn't, his book is suspect). Of course, a concordance would be useless, but Nave's ought to serve. An online query should yield others' efforts.
The Trinity by Bickersteth. Fantastic and very apprehendable
Also the Westminster Confession of Faith, available free online, the sections pertaining to the topic. Scripture proofs attached.
St. Patrick’s Bad Analogies on the Trinnity (4 minutes, humor)
“The problem with using analogies to explain the Holy Trinity is that you always end up confessing some ancient heresy”
https://www.youtube.com/watch?v=KQLfgaUoQCw
The Son of God declared that everything he has (not ‘had’, because he is still the same) he received from his Father, even his life.
In Nebuchadnezzar’s first (God given) dream, the Son is the ‘stone’ cut out of the ‘mountain’ without hands. (Mary didn’t make the Son of God, because only God can make a soul. Mary was used to help make a fleshly habitation for that soul here on earth).
The stone’s beginning was as an indistinguishable part of the mountain being brought forth ‘without hands’. And the stone would therefore have similar ingredients, although much smaller than the mountain. (As Jesus Christ said: My Father is greater than I.
On earth, men (and women) carry the seeds of their attributes, which are passed on as their procreated children.
Just like the Son of God, the Holy Ghost proceeds from God the Father. Both do the will of the Father, for even Christ said that his words were not his, but his Father’s. So, obeying the words of Christ, is actually obeying the Father.