From now on let no one cause trouble for me, for I bear on my body the marks of Jesus."
Gal 6:14:
But as for me, I will never boast about anything except the cross of our Lord Jesus Christ. The world has been crucified to me through the cross, and I to the world
The crucifixion of the world can only be a cosmic crucifixion, of the kind talked by Justin when he wrote:
"He has X-ed the Son of God in the universe"
(1 Apology 60:1-5)
It is very probable that the other Christians (who, independently from Justin, "read" that same crucifixion in Plato) gave a name to the killer: "He" was the demiurge, who crucified the Son of God on the cosmic Stauros.
Hence, the crucifixion was placed platonically in the intersection of cardinal points, since only a such cosmic crucifixion could be related to the entire world.
The consequence is that Paul, just as any earthly creature of the world - a crucified world - , had now the "marks of Jesus" in himself.