Alex @ Alexander Pruss’s Blog urges that even non-social trinitarians can make a priori arguments for their trinitarian theology based on the concept of perfection.
I don’t think these sorts of arguments work, as I explain in a comment there, but check it out – Alex is always worth a read, and maybe I’m all wet.
Related posts:
10 steps towards getting less confused about the Trinity - #8 - trinity vs. Trinity
SCORING THE BURKE – BOWMAN DEBATE – Bowman 1
Jay Smith and David Wood on religious confrontation vs. dialogue
no, Jesus is not a fictional character
podcast 79 - Dr. John Piper on why not everyone is elect
Ye Olde Trinity Diagram: The Shield of Faith
podcast 151 - Dr. Michael Rota on Pascal's Wager
some thoughts on Brown vs. Singer (1992)
podcast 64 - Dr. Mark C. Murphy on Anselmianism about God
podcast 29 - Arius