Lectio Divina means “divine reading.” It is not just a form of letting the Bible fall open and that’s what you’re supposed to read.
Lectio Divina is a 4-stage process of reading and, more importantly, of praying, scripture. Any passage will do, as long as it’s not too long. I have found the Gospels to be especially fruitful. The first stage is lectio (reading) where we read the passage slowly and reflectively.
The second stage is mediatio (reflection) where we think about the text and take in what God wants to give us
The third stage is oratio (response) where we leave our thinking behind and just let our hearts converse with God, inspired by our reflection upon the Word of God.
The fourth stage is contemplatio (rest) where we let go of all our thoughts and words and simply rest in the Word of God, listening at the deepest level of our being to the God who speaks to us with a still, small voice. As we listen we are gradually transformed from within.
These stages are not fixed rules of procedure but rather guidelines of how the prayer normally develops. Its movement naturally tends towards greater simplicity, with less and less talking and more and more listening.