When belief becomes identity, disagreement feels personal. Why does that happen?

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When belief becomes identity, disagreement feels personal. Why does that happen?
When belief becomes identity, disagreement feels personal. Why does that happen?
When belief becomes identity, disagreement feels personal. Why does that happen?
When belief becomes identity, disagreement feels personal. Why does that happen? https://dualisticunity.com/why-people-defend-paul-so-fiercely/