Martin Q. Blank said:
The Father begat the Son.
The Father and Son spirated the Holy Spirit.
Why did God stop communicating his divinity to subsequent persons?
Great question.
My simplistic understanding is that love requires a lover and a beloved, a relationship of two persons. Perhaps the perfection found in the relationship between a lover and a beloved is not attainable if another person is added? Can we say that a lover and a beloved is the irreducible number necessary for a relationship of perfect love?
We read in Scripture that God is love. Divine love, which is the exclusive domain of God, also requires a relationship. Divine love must necessarily be an infinitely perfect self-giving love because that is the pure essence of love; total self-giving. If God is love then we know that God's divine nature necessarily means that divine love is infinitely perfect.
God the Father (lover) eternally begets and perfectly loves God the Son (beloved), who eternally lovingly empties himself for love of the father and the love between them is God the Holy Spirit (spiritu sanctus = holy breath).
Put another way, God the Father is God. Proceeding from God the father is God's self-knowledge of himselfand this is actually the Son. God the Holy Spirit is the relationship of divine love between God's self-knowledge (the Son) and God (the Father). In loving the Father and the Son, the Holy Spirit
perfectly completes the Trinity, rendering any further divine persons impossible.
Takes three to tango!