Sometimes we hear it said that ten minutes on your knees will give you a truer, deeper, more operative knowledge of God than ten hours over your books.
What! Than ten hours over your books on your knees?
For my own part, I tend to find the doctrinal books often more helpful in devotion than the devotional books, and I rather suspect that the same experience may await others.
I believe that many who find that ‘nothing happens’ when they sit down, or kneel down, to a book of devotion, would find that the heart sings unbidden while they are working their way through a tough bit of theology with a pipe in their teeth and a pencil in their hand.