By Mark A. Taylor It”s easy to take for granted the creativity of others, especially those who must produce content on a schedule. Preachers, for example, stand to speak every week, some of them several times every week. Teachers fill class periods, sometimes with the overflow of their study, some of them by reading just ahead of their students in the textbook. Newspaper columnists and magazine writers must achieve a specific word count on deadline. Many who benefit from such output think it comes easily. But Rob Bell, speaking this April at the Festival of Faith and Writing at Calvin