John Chrysostom — as excerpted in the Catena Aurea on John 2:18-22

“(Hom. xxiii. in Joan. 3) TWO. things there were in the mean time very far removed from the comprehension of the disciples: one, the resurrection of our Lord’s Body: the other, and the greater mystery, that it was God who dwelt in that Body: as our Lord declares by saying, Destroy this temple, and in three days I will raise it up. And thus it follows, When therefore He had risen from the dead, His disciples remembered that He had said this unto them: and they believed the Scripture, and the word which Jesus had said.”