Here we learn of apostle Paul defending and proving his Apostolic authority, and asserts his right to continue the work God charged him and was demonstrating that he was with him. Being led by the spirit of God in performance of the tasks he was commissioned. He waved this part of his Christian liberty, for the good of others. Even so today God is still proving himself in those he has commissioned to perform the truth of the gospel until he comes to get the righteous on that great day.