John Lightfoot on Luke 24:32

[Did not our hearts burn within us?] Beza saith, "In one copy we read it written, Was not our heart hid?" Heinsius saith, "It is written hidden, in the best copies." Why then should it not be so in the best translations too? But this reading favours his interpretation, which amounts to this: "Were we not fools, that we should not know him while he was discoursing with us in the way?" I had rather expound it by some such parallel places as these: "My heart waxed hot within me, and while I was musing the fire burned," Psalm 39:4; "His word was in mine heart as a burning fire," Jeremiah 20:9. This meaning is, That their hearts were so affected, and grew so warm, that they could hold no longer, but must break silence and utter themselves. So these, 'Were we not so mightily affected, while he talked with us in the way, and while he opened to us the Scriptures, that we were just breaking out into the acknowledgment of him, and ready to have saluted him as our Lord?'

That is a far-fetched conceit in Taanith: "R. Alai Bar Barachiah saith, If two disciples of the wise men journey together, and do not maintain some discourse betwixt themselves concerning the law, they deserve to be burnt; according as it is said, It came to pass, as they still went on and talked, behold a chariot of fire, and horses of fire," &c. 2 Kings 2.