Students of the Bible will be aware of the act of circumcision that was performed in the Old Covenant. It was commanded of Abraham, and also in the Mosaic Law. These are good to remember, but some may be surprised by other circumcisions in the Bible. Those being the circumcision of the heart, and the circumcision of Christ.
Paul's boldness was remarkable. He preached the Good News of Christ to Jews and gentiles alike, regardless of their economic or social standing. He taught the poor and rich, men and women, Jew and Gentile. He declared the resurrection of Jesus Christ to kings, and others in authority. All of which was without shame or embarrassment.