“From Plato to Kant, the substance of what is known as the Golden Rule—one common to the world’s religious and moral traditions—has occupied philosophers across the ages. Lincoln’s own sensibility—both moral and political—was founded on this injunction. “As I would not be a slave, so I would not be a master,” he once wrote. “This expresses my idea of democracy.”
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Jon Meacham,
And There Was Light: Abraham Lincoln and the American Struggle