Just spent a little while writing a letter trying to explain the doctrine of the Trinity. Not an easy one to explain but I did my best in a page and a half and I try not to go much more than that in a letter to a apostate. I sure wish there was a good gospel tract that did the job better for me. Does anyone know of any? How do you explain the trinity? Cal and Armin should be united in this doctrine so I doubt there will be much debate here. I used Wayne Grudem's systematic theology to aide me in explaining the doctrine to this apostate. I know he will read my letter since we spoke on the phone and built some level of a relationship. The systematic theology summarizes the doctrine, while a good book on the topic may give me more depth than necessary to write a summary letter. Please explain the doctrine so I will see if I missed something.