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:
Richard of St. Victor 7 - The Same Divine Substance (Scott)
podcast 51 – Dr. Ravi Zacharias on the Trinity
podcast 158 - Listener Questions 3
flailing against the New Testament - part 2
podcast 217 - Bignon's Defense of Calvinism - Part 2
the Maverick Philosopher on some fashionable confusions
the evolution of my views on the Trinity - part 9
on interpersonal love and stick figures (Dale)
podcast 106 - Dr. James Spiegel on unbelief and belief in the Bible
Guest post: Questioning Craig's "Trinity Monotheism" – Part 1