'How does God convert their souls?'
To explain 'converting the soul' clearly, I want to tell you that anyone may be lost bodily...
He walks in a new place where he doesn't know its streets, and so he is lost.
It's possible
Sometimes, there is a man who is lost by mind.
May God save all
It's like those who fall in the sins of addiction that absent the mind.
There is a man who is lost by his soul.
We're watching him walking, eating, drinking, talking, and being counted among people, but his soul is lost.
The same was St. Peter and St. Paul.
But, What do You see, Lord!
He said; I see a great saint in Peter and a great saint in Paul as well... I want to convert their souls from this loss.
Let's see how God converted their souls from this loss.
God put a plan for Peter the apostle.
First, He converts his conscience.
Second, He converts his lost heart.