When the Testimony Walked Into the Room

Before Frederick Douglass ever stood on a platform, abolitionists in the North had heard plenty about slavery. They read pamphlets and printed testimonies. They studied travelers' reports. They saw woodcut illustrations of auction blocks and iron shackles. Each account carried a fragment of the truth, and each stirred the conscience. But in August 1841, when Douglass rose before the Massachusetts Anti-Slavery Society in Nantucket and began to speak, something shifted.…