Came across this on the Desiring God blog thought it was helpful:
J. I. Packer will turn 86 on Sunday. He is a skillful writer, a fruitful author, and many of his works have become classics, none more than Knowing God. Recently in our interviews with him in Vancouver we asked him for writing advice, or more specifically, what he would say to a budding writer of Christian nonfiction.
He offered three pieces of advice:
- Go deep in personal worship.
- Write to hit hearts.
- Write from a sense of calling.
To watch the video of J.I. Packer talking about these three points and to read the rest on the blog click on the picture below. 
