Theophylact of Ohrid

And they said one to another, Did not our hearts burn, within us while he talked with us by the way, and while he opened to us the scriptures? Their hearts then were turned either by the fire of our Lord's words, to which they listened as the truth, or because as He expounded the Scriptures, their hearts wore greatly struck within them, that He who was speaking was the Lord.

Catena Aurea by Aquinas ↗

Justin Martyr

Why did He rise in the flesh in which He suffered, unless to show the resurrection of the flesh? And wishing to confirm this, when His disciples did not know whether to believe He had truly risen in the body, and were looking upon Him and doubting, He said to them, "Ye have not yet faith, see that it is I;" and He let them handle Him, and showed them the prints of the nails in His hands.

Fragments of the Lost Work of Justin on the Resurrection, Chapter IX ↗

Augustine of Hippo

Just as we are distinguished from others by faith, so let us also be distinguished by morals and by works. Let us be on fire with charity, which the demons never had. It is the fire those two also were burning with on the road. When Christ, you see, had been recognized and had left them, they said to each other, "Did not our hearts burn within us while he talked to us on the road, while he opened to us the Scriptures?" Burn then, in order not to burn with the fire the demons are going to burn with.Be on fire with the fervor of …

Sermon 234.3 ↗

Ambrose of Milan

Therefore, good charity having the wings of a burning fire, which flies through the chests and hearts of the saints, and consumes whatever is material and earthly: it tests whatever is sincere, and improves whatever it touches with its fire. This fire the Lord Jesus sent upon the earth, and faith shone forth, devotion was kindled, charity was illuminated, justice shone brightly. With this fire, he inflamed the hearts of his apostles, as Cleophas testifies, saying: Was not our heart burning within us, while he opened the Scriptures? …

Isaac, Or The Soul 8.77 ↗

Gregory the Dialogist

Those who said had conceived this fire of teaching from the very mouth of Truth: "Was not our heart burning within us while He spoke on the way and opened the Scriptures to us?" For from the word heard the soul is set ablaze, the cold of torpor recedes, the mind becomes anxious with heavenly desire, estranged from earthly concupiscences. True love, when it has filled the soul, torments it with tears; but while it is tormented by such burning, it is fed by its very torments. …

Forty Gospel Homilies, Homily 30 ↗