Paul has endurance and passion. He speaks all night and travels the next day with Jerusalem in his sites.
He sums up his purpose–he has endured everything, he has proclaimed the message to everyone, he has maintained integrity. He warns them that the message will become distorted to entice people to follow it. He warns them to be alert.

How does that show up, distorting the truth? May we be alert as we trust the message of his grace.

That second part is the part that feels less fearful: v32, the message builds us up.