The whole point of building theoretical systems is to explain what humans know by pre-theoretical experience. That is the starting point for any philosophy. That is the data it seeks to explain. If it fails to explain the data of experience, then it has failed the test. It has been falsified.
Nancy PearceyOnly a God of love is fully personal. Thus the Trinity is crucial for maintaining a fully personal concept of God. As theologian Robert Letham writes, “Only a God who is triune can be personal.... A solitary monad cannot love and, since it cannot love, neither can it be a person.” Therefore it “has no way to explain or even to maintain human personhood.
Nancy Pearcey