According to Chapter 4, what specific signs of societal and religious decline signal the need for a saint to take birth?

Chapter 4 provides a detailed list of conditions that necessitate a saint's incarnation. These signs of decline include when Brahmins despise their own caste, religious teachers are insulted, and people in every house consider themselves scholars without respecting others. The text also mentions that when people ignore proper conduct, consume forbidden things like liquor and meat openly, and commit atrocities under the guise of religion, it is time for a saint's advent. Furthermore, as Chapter 4 explains, when even dedicated practitioners like Brahmins, ritualists, and Yogis grow tired of their spiritual duties, a saint descends to restore righteousness.