What central belief do both Lincoln and King present in their speeches?

Both Abraham Lincoln and Martin Luther King Jr. emphasize the fundamental principle of equality and the enduring promise of freedom in their speeches. Lincoln's "Gettysburg Address" underscores the importance of a nation dedicated to the idea that all men are created equal, while King's "I Have a Dream" speech articulates a vision of a society where people are judged by their character, not their skin color. This shared belief in equality and justice serves as a powerful call for unity and progress in their respective contexts.