The inspiration for cleaning up his vocabulary came from God himself, Duterte said, as he was flying back to the Philippines from a state visit to Japan.
"Everybody was asleep, snoring, but a voice said... 'If you don't stop (cursing), I will bring this plane down now.' And I said, 'Who is this?' So, of course, it's God," the President recounted after he landed Thursday at Davao International Airport.