Without a knowledge that God is eternally Father to the Son, we will not understand the marvel of that highest privilege of the gospel: the adoption unto Sonship into which are admitted in union with Christ by which we can cry “Abba, Father!”

I’ve already written of the recent controversy over the Trinity and my hope that solid, theological and spiritual reinvigoration would come from it. All the same, I ran across a fantastic passage in the great divine Herman Witsius’ treatment of the Trinity in his Sacred Dissertations on the Apostle’s Creed (a remarkably careful and pastoral work).

In his comment on the Trinitarian shape of the Apostle’s Creed, he has a short segment arguing for the importance of our knowledge of this chief point of Christian doctrine. It’s not only that a proper understanding of the Trinity is some sort of arid proposition we need to check off a list of “need to know” facts to be “good Christians.” Rather, it’s that without a knowledge of the Trinity, we are simply robbed of all of the chief comforts of Christian faith:

When the Trinity is not known, the necessary consequence is, that the principal foundation of our faith and comfort, are unknown. All the treasures of wisdom and knowledge are hid in the mystery of God, and of the Father, and of Christ.

In order to explain this, he goes on to expound the importance of recognizing the work of each person individually, beginning with the Father:

I cannot know how God can show mercy to a sinner in a manner worthy of himself, unless I know he has a Son whom he could send to make satisfaction for sin, and a Spirit who can apply to me the merits of the Son.

Right off the bat, you see the Trinitarian shape of the heart of God’s atoning, justifying, and sanctifying work with the Father sending the Son in the economy of redemption and the Spirit’s application. Continuing on:

If I know not that the Father is God, I shall be ignorant that I am a Son of God,–which is the sum of our felicity.

Without a knowledge that God is eternally Father to the Son, we will not understand the marvel of that highest privilege of the gospel: the adoption unto Sonship into which are admitted in union with Christ by which we can cry “Abba, Father!”

But according to Witsius, that Fatherhood is only good news to us if we recognize God the Son:

If I know not that the Son is God, I shall not form a right estimate of the love of God the Father who has given him to me, nor of the grace of the Son, who, though possessing inconceivable majesty, humbled himself so wonderfully for my sake;

It’s fascinating to see how Witsius is at once trying to point out the importance of each of the persons in the work of salvation, but can only do so with reference to the other persons. (Indeed, earlier on, he spends a good deal of space explaining the unified activity of the whole Trinity in every act ad extra, the one will, mind, and operation of the Godhead and so forth.) But here we see that we can only understand the love of God the Father being magnified in the gift of the eternal Son, whom we can only recognize as majestic in his self-humbling in the working of salvation.

But he pushes on to point out further how the Son’s divinity is crucial to our soul’s peace:

 –nor shall I be able to place a firm dependence upon his satisfaction, which could not be sufficient unless it were of infinite value, or to rely securely on his power, which cannot save me unless it be evidently omnipotent;–it will be impossible for me, in short, to regard him as my Saviour and my Chief Good, because none excepting the true God of Israel is Israel’s God and Redeemer.

The Son’s divinity matters because otherwise, any satisfaction he makes would be merely finite, insufficient for the weighty work of a cosmic atonement. Second, we have strong enemies—sin, death, and the devil—how can I have assurance of the Son’s victory if he is not almighty God himself? Only the “the true God of Israel is Israel’s God and redeemer.”

Finally, he turns to the person of the Holy Spirit:

If…I am not sure that the Holy Spirit, to whose direction and government I ought to commit myself, is God, I shall not be able to esteem my subjection to him as true liberty, to maintain a holy acquiescence in his protecting care, or to rely on his testimony respecting my salvation as a most ample security.

If the Spirit is not God, then submitting to him isn’t the true freedom and dignity of serving the highest Lord. Nor is receiving the Holy Spirit as another counselor the great gift that Jesus says it is (John 16). And listening to his internal witness or testimony via Scripture isn’t hearing the voice of God himself assuring me of my salvation.

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