Stephen is the first non-apostle to whom miracles are ascribed, as well as the first non-apostle whose sermon is recorded. He obviously had a powerful, visible, and influential ministry. Stephen was also a skilled apologist in defending the faith probably on themes as the death and resurrection of Jesus, and Old Testament evidence that He was the Messiah. Stephen was the victim of a lying conspiracy. When he was brought before the council, the accusations against him were the same that the religious leaders used against Jesus.
2 Peter 3:8-10
8 But do not overlook this one fact, beloved, that with the Lord one day is as a thousand years, and a thousand years as one day. 9 The Lord is not slow to fulfill his promise as some count slowness, but is patient toward you, not wishing that any should perish, but that all should reach repentance. 10 But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the earth and the works that are done on it will be exposed.