Good writers don’t moralize, nor do they preach, but they do create longing for the true and the beautiful, and that is why you must write with Christ at the center of your reason for writing. That does not mean that every book must be a retelling of Luke’s gospel, however, every worthy book written by a Christian will direct readers away from self, and sin, and put them on a quest for God and his gospel. Create longing for these things.