“The Trinity as a contradiction of basic language”

This is a pretty simple illustration of the logical problem at the core of mainstream orthodox Trinitarianism:

http://scripturalmormonism.blogspot.com/2016/06/the-trinity-as-contradiction-of-basic.html

One response, of course, is to say “It’s a mystery.”

Fine.  But it remains logically incoherent.

Which is a bit of a problem.

“And this is life eternal,” declares Jesus himself in John 17:3, “that they might know thee the only true God, and Jesus Christ, whom thou hast sent.”

If, however, God is essentially unknowable — if the relationship between God the Father and the Son is both essential and logically incomprehensible — eternal life seems pretty much out of reach.  But that would seem to contradict a fundamental message of Christianity and the New Testament.