Victorinus of Poetovio
"The temple of God was opened in heaven" is the manifestation of our Lord. The temple of God is His Son, as He Himself says: "Destroy this temple, and in three days I will raise it up." When the Jews say that this temple was built in forty-six years, the Evangelist says: "He spoke of the temple of His body" (Jn 2:19-21). The ark of His covenant is the proclamation of the Gospel, the forgiveness of sins, and all that will come with Him. John says that this has already been made manifest.