According to Chapter 4, what specific signs of societal decay necessitate the advent of a saint?

Chapter 4 provides a detailed list of conditions that signal a decline in righteousness, prompting a saint's incarnation. These signs include Brahmins despising their own caste while Shudras attempt to become Brahmins, religious teachers being insulted, and widespread disrespect among people. Furthermore, the text cites a complete disregard for proper conduct and diet, even to the point of Brahmins openly consuming liquor and meat. As described in Chapter 4, when sectarian hatred grows, when people become tired of their spiritual practices, and when atrocities are committed under the guise of religion, the time is ripe for a saint to descend.