How does Chapter 4 describe the selfless mission of saints and what happens once their work is complete?

According to Chapter 4, saints are naturally liberated beings whose incarnation is purely for the sake of others, with no personal self-interest. Their profound mission is to protect the humble, poor, and weak, and to destroy irreligion. The text describes their work metaphorically, stating they fill the foundation of Renunciation (Nivritti) to build the temple of Ultimate Truth. Chapter 4 explains that they work to awaken faith and easily uplift devotees. Once their specific task of restoring religion is fulfilled and their mission is complete, they end their incarnation, having re-established the path of righteousness for others.