What does Chapter 4 reveal about the selfless purpose behind a saint's incarnation in the mortal world?

Chapter 4 powerfully underscores the selfless nature of a saint's incarnation. It clarifies that saints are 'naturally liberated,' meaning they do not need to be born for their own spiritual progress. Instead, their descent to Earth is 'purely for the sake of others,' and they 'have no self-interest.' The chapter explains that their purpose is to uplift the distressed, protect the humble and the weak, and destroy irreligion. They come to awaken religion and provide people with a chance for self-upliftment when society has lost its way, acting entirely out of compassion for humanity.