The reading and the study are I believe the "eating" of the flesh of Jesus. Then comes the Comforter, the Holy Ghost, to quicken (bring to Life) what we have eaten.
Just wanted to expand further on this point. To eat something is to take it into your being (put into your mouth), chew it for a while, swallow it, and then your body digests it, breaks it down and then your body extracts the nutrients and the goodness, and then what you have eaten becomes part of you.
Three things we must do:
Eating: Reading and studying gets the Word into our mind,
Chewing: Dwelling upon it, meditating on it, with prayer, gets it into our deeper parts, our heart and spirit.
Swallowing: Take the Word deep into your being, apply it to your life. Natural food goes into the stomach, the Word of God must also get into the center of our being.
Three things our "stomach etc" (i.e. the Holy Spirit) does for us:
Digestion: the Word will sit inside us for a little while and linger around, as it's gradually digested
Nutrients extracted: the Holy Spirit will take what we have received, and apply the Word to the areas in our being where it is required. This is to apply the life and light to our deadness and darkness so that we can be more alive and more filled with light.
Becoming part of us: When the Spirit applies the Word to our being and this becomes part of us, we will look more like Christ, in His image.
Mere theological knowledge is like putting the food in the mouth but then spitting it out instead of swallowing it.