Acts 24-26
Paul was arrested, imprisoned and tried on trumped up charges by the religious leaders of the day. He spoke truth. They fought truth. (Sound familiar?)
He essentially gave testimony to his own life experiences. He told of what had happened to him on the road to Damascus when the Lord spoke out of a great light from heaven. His entire background prepared him to witness to Festus about his conversion and the power of the Gospel working in his life. He also mentioned praying for Festus to understand the Gospel.
These two elements are predominant; (1) he gave testimony of his own experience, and (2) he was committed to prayer for unbelievers.
Testify and pray.
Testify and pray.