I believe, with almost everyone else who has ever thought about the matter, that the doctrine of the Trinity is deeply mysterious. And that seems fully appropriate, since this doctrine concerns the metaphysics of the nature of God and it would be hubris of the highest degree for us to suppose our minds were capable of understanding the divine essence. The point in our offering this model is to indicate that good sense can be made of the notion of God as “three in one.”
— Thomas Senor, from Reason for the Hope Within, p. 257
If God is not Triune, he cannot love until he creates. Thus, love would be a quality he gains, not an unchangeable moral perfection deep in his being.
— Greg Koukl, from The Story of Reality, kindle location 1668
It seems that in reality the doctrine of the Trinity is that which is necessary to make sense of the New Testament statements regarding God the Father, the Son, and the Holy Spirit, and their relations to each other and to men, rather than that which is openly taught and advocated by the New Testament. Continue reading
There is one and only one God, eternally existing and fully expressed in three Persons, the Father, the Son, and the Holy Spirit. Each member of the Godhead is equally God, each is eternally God, and each is fully God—not three gods but three Persons of the one Godhead. Each Person is equal in essence as each possesses fully the identically same, eternal divine nature, yet each is also an eternal and distinct personal expression of the one undivided divine nature.
— Bruce Ware, from Father, Son, and Holy Spirit: Relationships, Roles, and Relevance, kindle location 1427
The doctrine of the Trinity … is truth for the heart. The fact that it cannot be satisfactorily explained, instead of being against it, is in its favor. Such a truth had to be revealed; no one could imagine it.
— A. W. Tozer, quoted in Without a Doubt by Kenneth Richard Samples, kindle location 620