Ezenzeleni provides Stephen Kumalo a moment to reflect. The chaos of Johannesburg has confused the unfundisi and without the hopeful environment of Ezenzeleni, Stephen's epiphany would not have occurred.
Msimangu quotes from the Bible during his sermon to the blind: "I the Lord have called thee in righteousness . . . To open the blind eyes to bring out the prisoners from the prison / And them that sit in darkness of the prison house."
Obviously, Msimangu is speaking directly to Stephen.
Now that Kumalo has seen Johannesburg first-hand, he can face its threats in a knowledgeable and therefore more successful manner. Kumalo was blind, but know he sees why the tribe is being destroyed.
Stephen will return home with insight which will help strengthen his people.