Jesus made Himself known to the disciples at Emmaus in the breaking of the bread. When they returned to Jerusalem, they made a particular point about relating this aspect of the story.
Now we know that the Lord deals with us in this Supper, but we sometimes assume that the only sins He deals with are the obvious, carnal sins—lust, anger, and so on. And of course, He does this, but note here that that Jesus was addressing a sin problem in a different place. He was correcting their exegesis in the breaking of the bread; He was admonishing their rigidity in how they read the Old Testament. He was rebuking their doctrine and admonishing their hermeneutic.
God deals with us in this Supper, but He does not just deal with us “morally.” He deals with our minds, how we think, how we understand our duties as Christians. He does not just rebuke our vices, in other words, He also rebukes our virtues, and this includes what we think are our theological virtues.
The two disciples walking to Emmaus obviously loved the Lord Jesus, and were downcast at what had happened to Him. They were not conscious of struggling against any great temptation, and yet they were walking under a cloud of unbelief. Our Lord Jesus, in His great kindness, and with a wonderfully understated humor, came to them and dispelled that cloud.
We are seated at that same Table, and the Lord Jesus is breaking bread for us, just as He did for them. He is the Lord; He is risen. Follow Him!