I have used a lot of different devotional books in my day, with varying degrees of success. I remember being enamored, long ago when I was in college and sort of a Jesus-fanatic, of a classic called God Calling, which I read more-or-less faithfully for a while. God Calling was supposed to be the voice of God coming directly to me— and all of the other people who bought the book as well. I also vaguely remember a book called Come Away, My Beloved. The title makes alone time with God seem sort of, well, seductive, in a way. I don't remember if the contents of the book delivered on that promise.
Then there was the task of finding a daily Bible reading.