Final answer:
Paul was astonished by the Galatians as they were quickly abandoning the gospel he preached, instead turning to a different one. In The Acts of Paul and Thecla, he's also astonished by Thecla's commitment to the faith and her decision to live a life dedicated to preaching over traditional roles.
Step-by-step explanation:
Paul was astonished by the Galatians because they were quickly deserting the gospel he had preached to them and were turning to a different gospel. This astonishment can be seen as Paul attempts to spread Christianity and encounters various responses to his teachings. He sought to reclaim people from corruption and teach them about the salvation offered through Jesus Christ. His message was especially radical in contrast to the existing Roman values, emphasizing personal faith over social and familial obligations. Furthermore, in the context of The Acts of Paul and Thecla, Paul is astonished to see Thecla, a young woman who had been converted to Christianity and had chosen a life dedicated to the faith over traditional roles like marriage. Her presence, along with a crowd, indicates that she is bringing new trials or challenges that Paul has to face. Her deep commitment to the faith, including her rejection of marriage and her embrace of preaching, illustrate the transformative impact of Paul’s teachings.