Wikipedia
Self-affirmation theory is a psychological theory that focuses on how individuals adapt to information or experiences that are threatening to their self-concept. Claude Steele originally popularized self-affirmation theory in the late 1980s, and it remains a well-studied theory in social psychological research.
Self-affirmation theory contends that if individuals reflect on values that are personally relevant to them, they are less likely to experience distress and react defensively when confronted with information that contradicts or threatens their sense of self.
Experimental investigations of self-affirmation theory suggest that self-affirmation can help individuals cope with threat or stress and that it might be beneficial for improving academic performance, health, and reducing defensiveness.