Paul claims to speak for God, except where he stipulates that he is speaking his own mind, and is accepted by his followers as speaking for God. And Paul was accepted to carry a message, which he apparently lost, for he eats that which was sacrificed to demons, according to some unknown author of Acts, who might have been Luke, who witnessed nothing (Luke 1:1-3), and was supposedly an associate of Paul, who would be a source for Luke. If someone is their own witness, their witness is "not true" (John 5:31). As for the witness of the unknown author of 2 Peter 3, well, it is from an unknown author, who is playing at being Peter, who was the "worthless shepherd" of Zechariah 11:16-17, who would not care, feed, or fend the sheep, but who would "eave the flock" (Zechariah 11:17) & (Acts 15:7). Also the "worthless shepherd" was the 2nd "staff" taken to "pasture" the "flock doomed for slaughter" (Zechariah 11:7). It would be best to not be a member of that flock.