Eliza Lee Cabot Fallen's "Conscience" is a famous anti-slavery treatise of the 19th century that actively supported the abolitionist movement in the United States. The book examines the negative consequences of slavery on society and individual conscience, and highlights the moral aspects of this issue. In her work, the author reveals the injustice of slavery as a system and calls for the fight for the rights and freedom of every person. "Conscience" is not only marked by a deep philosophical background, but also became an important contribution to the opposition to slavery and the support of humanitarian values in society.