Whether or not man perceives of the three personal subsistences does not obviate that they exist, and have existed eternally.
No: God said it. I believe it. That settles it. <-- a popular bumper sticker in need of correction.
Yes: God said it. That settles it.
You have all these non Calvinists thanking you for a Calvinist error teaching. lol Sad.
God saying it and one believing it is the difference between life and death.