We all want progress, but if you're on the wrong road, progress means doing an about-turn and walking back to the right road; in that case, the man who turns back soonest is the most progressive.
The C. S. Lewis Signature Classics (8-Volume Box Set): An Anthology of 8 C. S. Lewis Titles: Mere Christianity, The Screwtape Letters, Miracles, The ... The Abolition of Man, and The Four Loves