The abolitionist John Woolman (1720-72) has been described as a Quaker saint, an isolated mystic, singular even among a singular people. But as historian Geoffrey Plank recounts, this tailor, hog producer, shopkeeper, schoolteacher, and prominent Quaker minister was very much enmeshed in his local community in colonial New Jersey and was alert as well to events throughout the British Empire. Responding to the situation as he saw it, Woolman developed...