For my next desert island bookshelf pick, I would grab my small two volume verison of the Apostolic Fathers (Loeb Edition). These letters have been invaluable for me when I think about the secondary and tertiary ripples of the impact of the incarnation. Somehow, yes, we can understand the first ripple of the "Yes" to Christ that Peter gives or even the awe inspiring conversion of Paul. But, for the second and third ripple of those who did not know Jesus but knew Mark. Here in the Apostolic Fathers (vol. I and vol. II), we see how the good news hits the fan.
My favorite is Ignatius of Antioch:
"I prefer death in Christ Jesus to power over the farthest limits of the earth. He who died in place of us is the one object of my quest. He who rose for our sakes is my one desire."
As I'm seeking coconuts on my desert island, I'll have one of these pretty volumes in my frayed cargo shorts pocket.