The apostle Paul wrote letters, and used the available technologies to get them delivered—whether ships, or Roman roads, or carts, or parchments, or pens. He would have preferred to have been with the Galatians in person, but he used technology to close the gap. The Reformation began in 1517, and the moveable type printing press was invented a short time before that, somewhere around 1450. It is hard for us to envision what we know as the Reformation without the technology of printing and printed editions of books.
