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Excerpted from: THE ACTS OF THE APOSTLES - An Exposition, by A.C. Gaebelein; 1912 (ch. 7) link
Acts 7:55-56 'But he, being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God, And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God'
Stephen had been accused of speaking against Moses and against God, also against the temple and the law [Acts 6:12-14]. These accusations he is asked to answer. What he declared before the council shows plainly that the accusations are utterly false.
Indeed his whole testimony as he rapidly speaks of past history in his great and divinely arranged retrospect, is a most powerful testimony to the nation as well as against the nation. Every word was true. The entire testimony was unimpeachable. Stiffnecked and uncircumcised, resisting the Holy Ghost, persecuting the prophets who prophesied of Christ and the murderers of the Just One [Acts 7:51-53]! This was their condition. With this the testimony of Stephen is ended; more than that the testimony to the nation is now to be closed. No longer is the offer to be made to Jerusalem.
The arrows of the truth of God carried by the power of God’s Spirit had cut to the heart and they gnashed on him with their teeth [Acts 7:54]. In their madness they were dumb. They did not find words to give vent to their burning hatred which Satan had kindled in their stubborn, unbelieving hearts. All they could do in their frenzy was to gnash with their teeth.
In the midst of this wicked crowd, no longer the council but a murderous mob, stood Stephen. Three things are said of him. He was full of the Holy Ghost; He looked steadfastly into heaven seeing there the Glory of God, He saw Jesus standing on the right hand of God [Acts 7:55].

