Not in vain has Lincoln lived, for he has helped to make this republic an example of justice, with no caste but the caste of humanity.

Bancroft’s line frames Abraham Lincoln’s life as historically consequential not merely for preserving the Union, but for advancing the United States toward a moral ideal: a republic grounded in justice and human equality. The phrase “no caste but the caste of humanity” rejects inherited rank and racial hierarchy, implying that the only legitimate “class” is the shared dignity of all people. In this reading, Lincoln becomes a symbol of democratic universalism—an exemplar whose leadership helped align American institutions with their professed principles. The sentence also has an elegiac, commemorative tone, suggesting it was meant to console and to fix Lincoln’s legacy in the nation’s civic memory.