What are the motifs in Why We Can't Wait by Martin Luther King?

Just compared to an unjust law is a recurring idea in the book. MLK is criticized by eight fellow clergymen for activities that have landed him in jail. He responds to their critical open letter with a lengthy explanation of the theory and principles that underlie his plan of action. The major element of his discussion relates to the distinctions between just and unjust law. Since these critics are his colleagues in the business of religion, although of many denominations, MLK offers ecumenical comments to clarify his thoughts about centuries of Catholic, Jewish, Protestant and secular ideas.