Arthur.k (regarding Trinitarian doctrine) . . . .
Yes I’ve referenced that, but still doesn’t explain in a logical sense how it’s possible
There are alleged “truths” that go against reason. Falsehoods.
There are truths consistent with reason. (i.e. 1+1=2).
But there are truths that are ABOVE human reason that have to do with God.
Concerning God . . . We would EXPECT some truths ABOVE reason (that a finite human mind could never grasp), because of WHO God is (The eternal infinite “I Am”).
As a matter-of-fact, if ALL truths concerning God were deducible by mere human reason, you would no for sure that ISN’T God.
Q: But HOW can we know those Truths that exceed human reason?
A: Only one way. They MUST be revealed to us. Things like the Incarnation, the Trinity, and the problem of evil, are all things we can and should explore, but we can never completely unpack such truths.
Q: OK. But HOW do we know for SURE, they are “truths” and we are not being fooled by false doctrine?
A: The Resurrection and reliable witnesses (martyrs) to the Risen Christ along with grace.
These truths that are ABOVE reason, are sometimes called . . . “Mysteries”.
We know God is Trinity, because God tells us He is Trinity. That’s WHY we can have an ETERNAL Father.
Because He has been “Fathering” from all eternity. So that means there HAS TO be someone that He is “Fathering to” eternally – the Son.
God is ONE God. But He is Three Divine Persons in that ONE God. And we know this, because God tells us this.
Hope this helps.