There is no other name under heaven given to men by which we must be saved

Acts 4:1-12
The priests and the captain of the temple guard and the Sadducees came up to Peter and John. They were greatly disturbed because the apostles were teaching the people and proclaiming in Jesus the resurrection of the dead.
Many of those who listened had already believed the Message - in round numbers about five thousand!
By what power or what name did you do this?
Peter, filled with the Holy Spirit, said to them: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed. He is "the stone you builders rejected, which has become the capstone. Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved."
It is the teaching, centering on the risen Christ, which annoys the Sadducees - naturally enough, since they denied the possibility of resurrection. The resurrection was at the heart of the Christian message from the beginning.
Why?
Peter was filled with the Holy Spirit, so he clearly proclaimed that it is by the name of Jesus Christ, they can healed the cripple. And he proclaimed Jesus is resurrection from the dead. Peter told the truth. He didn't fear to says and to proclaim the truth.
People who has power of political are disturbed and against the truth, but people who listened and believed that Jesus is the Lord.
How?
I like to preach gospel for it is the truth, Jesus is the Lord, there is no other name under heaven given to men by which we must be saved.