In a pair of texts published in 1795, the philosopher, physician, and public intellectual Johann Benjamin Erhard offered a broadly Kantian defense of the right to revolution under conditions of structural injustice. Erhard’s theory of revolution is of continuing interest, for Erhard’s theory touches on difficult practical questions related to what we might call the ethics of revolutionary action. The primary aim of my paper is reconstructive; I aim to give a philosophical account of the overall shape of Erhard’s theory of justified revolutionary action. In the course of my reconstruction of Erhard’s account, I focus especially on the central role of epistemic limitations regarding the consequences of revolutionary action in Erhard’s account. Erhard is focused on the fact that revolution is an inherently risky endeavor, with potentially enormous downsides for society, and for those on whose behalf revolutionaries purport to act. Erhard takes the problem of revolution’s dangerous unpredictability very seriously as an obstacle to the justification of revolutionary action. This is both a merit of his account, and the source of some interpretative and philosophical puzzles, which occupy me in the second half of the paper.