Leithart puts it this way in a sermon on Luke 24:
"But Word by itself is not enough. Even after Jesus has explained everything about Himself in the Scriptures, the two disciples still don’t recognize Him. That occurs only when He breaks bread with them It is the same for the church throughout the ages: The Word without the Bread is merely intellectual, detached from the things of real life; the Bread without the Word turns into a magic act. When the Scriptures are taught and the Bread is broken, then Jesus can be known."Elsewhere he also notes from the structure of Luke 24:
"the point of the structure is to highlight the mission that the disciples are being given. Through an encounter with the Risen Jesus in Word and Meal, the two disciples go back to the base of operations in Jerusalem and are transformed into witnesses."Spare half an hour to hear Stu's sermon here:
Hearing God Speak through Communion.