Click here to go to Acts 4
13 The members of the council were amazed when they saw the boldness of Peter and John, for they could see that they were ordinary men with no special training in the Scriptures. They also recognized them as men who had been with Jesus.
I might disagree that they didn't have special training, after all they spent 3 1/2 years learning from Jesus. Though as we talked about several times while reading the Gospels they never seemed to "get it." But thankfully Jesus left them (and us) the Holy Spirit to bring the things Jesus' taught them back to their memory and help them understand what He meant.
I love the fact that after the encounter with the religious leaders they went back together and prayed for courage to continue speaking God's truth. And God responded:
31 After this prayer, the meeting place shook, and they were all filled with the Holy Spirit. Then they preached the word of God with boldness.