For had the actual creation of the heavens been opened, he would not have said, “were opened to Him,” for a physical opening would have been open to all.
But some one will say, What, are the heavens then closed to the eye of the Son of God, who even when on earth is present in heaven? But it must be known, that as He was baptized according to the ordinance of humanity that He had taken on Him, so the heavens were opened to His sight as to His human nature, though as to His divine He was in heaven.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).