He saw heaven open and something like a large sheet being let down to earth by its four corners.
11. The opening of heaven signifieth, in my judgment, another thing in this place than in the seventh chapter. For it is said there that heaven was opened to Stephen, that he did behold the glory of Christ; in this place Peter saw our heaven which we see divided, so that a sheet came thence.
Cornelius had received positive orders from heaven to send for Peter, whom otherwise he had not heard of, or at least not heeded; but here is another difficulty that lies in the way of bringing them together - the question is whether Peter will come to Cornelius when he is sent for; not as if he thought it below him to come at a beck...
Commenting on Acts 10:9-18
And saw heaven opened,.... Not literally, as at the baptism of Christ, and the stoning of Stephen; but in a visionary way, and which was an emblem of the opening and revealing the mystery of the calling of the Gentiles, which in other ages was not made known, as it now and afterwards was: and a certain vessel descending unto him, as it had been...