A. W. Tozer, 1897-1963, was a preacher, an editor, a writer. He wrote some of his books on his knees; his writings were extensions of his prayers.
“I am often caused to wish that there were some way to bring modern Christians into a deeper spiritual life painlessly by short, easy lessons: but such wishes are vain. No shortcut exists. God has not bowed to our nervous haste nor embraced the methods of our machine age. It is well that we accept the hard truth now: The man who would know God must give time to Him.”
(from The Pursuit of Man)