The seven thunders uttering their voices signify, the Holy Spirit of sevenfold power, who through the prophets announced all things to come, and by His voice John gave his testimony in the world; but because he says that he was about to write the things which the thunders had uttered, that is, whatever things had been obscure in the announcements of the Old Testament; he is forbidden to write them, but he was charged to leave them sealed, because he is an apostle, nor was it fitting that the grace of the subsequent stage should be given in the first.