I try my best to write the will of God, I can definitely say that often doesn't happen. Either I mishear what God's really trying to say, or I make something up in a human way.
I started writing a few months ago now, it was my Uncle that really inspired me to do so as he told me about faith writers after I became born again, so I started to read some of his articles and felt encouraged. It all started from there.
For me writing is one of my callings as It comes most natural to me, but that is not to say that everyone will be called to write, because we all play a part in the body of Christ. Some will evangelise, some may preach, some may encourage but God has chosen writing for me.