Historical Precedent: King references historical instances of protests against unjust laws, such as the Boston Tea Party and the American Revolution, to demonstrate that civil disobedience can be a legitimate and effective means for initiating social change.
Religious Belief: King draws on his Christian beliefs and religious teachings as the ultimate moral basis for his commitment to nonviolent direct action, showing how his convictions are rooted in a higher moral law.
Personal Experience: King shares his personal experiences as a civil rights activist, including his incarceration and mistreatment in Birmingham, to demonstrate his genuine commitment to the cause and the sacrifices he is willing to make for justice.
Ethical Reasoning: King presents well-reasoned arguments rooted in ethical principles such as justice, equality, and human dignity, demonstrating his intellectual rigor and his commitment to a principled approach.
Appeal to Audience: King carefully tailors his arguments to the concerns of his audience, showing an understanding of their concerns and seeking to address them in a persuasive way, thus enhancing his ethos.
Use of Rhetoric and Language: King's letter is known for its eloquent use of language and persuasive rhetoric, which also contribute to his credibility.
By combining these methods to convey his message, King effectively establishes his ethos and builds a strong case for the moral necessity of civil disobedience and the urgent need for social change.