And the temple of God was opened in heaven: and the ark of his testament was seen in his temple, and there were lightnings, and voices, and an earthquake, and great hail.
Glossa Ordinaria
And it was opened. In this fourth vision you have matter well adorned and having good helps, namely concerning the battle of the Church, which is assailed by the devil both openly and secretly; and in all these things John shows her to overcome, whereby he most of all arms the faithful lest they fail in any tribulation. The knowledge, therefore, of the Church's battle depends upon the third vision, which is about the office of preaching that was enjoined. The temple of God was opened, that is, the Holy Spirit was given, through whom the mysteries of the Church, which were figured by the second tabernacle, were revealed to the faithful. The ark. Christ is the ark in whom all the treasures of wisdom are hidden, who fulfilled the Old Testament and instituted the New. And great hail. That is, to certain ones the preaching seemed intolerable.
English is machine-translated from the public-domain Latin (Glossa Ordinaria, Migne, Patrologia Latina 113-114, 1852; digital text from Corpus Corporum, mlat.uzh.ch), since no public-domain English translation exists. It is not a scholarly translation. Please report errors.