Stephen had "an irresistible ministry"!  He was a Scripture-scholar, extremely skilled and astute in using the Old Testament to defend his faith in Jesus.  He was a Christian apologist ("apologia" is a Greek word that refers to "a speech in defense of something").

Stephen's POWERFUL message of Acts chapter 7 was basically a last major appeal to the leadership of Israel (the Sanhedrin Council) to accept Jesus as the long-promised Messiah.  Stephen was brought for trial before the Council, falsely accused of four things: speaking blasphemous words (1) against Moses, (2) against God, (3) against the Temple, and (4) against the Law.  While he stood before his opponents and their lying accusations, his face was glowing with the righteousness of truth and the glory of God!  Amazing.  By visibly putting His "glory stamp" on Stephen's face, the Lord Jesus was showing forth His approval of the message he had been proclaiming in the synagogues and which he was about to proclaim in Acts 7.

Stephen's message was his response to the evil high priest's question, "Are these things so?" - referring to the four accusations against him.  In verses 2 to 50, he managed to keep his hostile listeners' attention by talking about their favorite subject: themselves and their heritage!  Yet, as he reviewed the major periods of Jewish history, he indirectly was responding to the false and accusations against him and building his case against them!   His sermon is brilliant on so many levels!  It was completely irrefutable, and cost him his life.  

In this lesson, Stephen began his "history lesson" regarding Israel's period of the patriarchs by speaking about Abraham.  You have to listen to how absolutely clever Stephen was in using "father" Abraham to convict the Jews of their own sinful prejudices!