In this 2016 James Backhouse Lecture, Margery Post Abbott explores the interplay between faith and action, drawing on her wide range of experiences as a scholar, activist, sailor and Quaker. Taking an ethical stance, acting on the concern for justice and the yearning for peace, does much to open hearts. Yet some activists get burnt out or caught up in the tangle of power or pride, becoming what they were resisting. Friends have always asserted that there is a source of strength and guidance that, paraphrasing William Penn, changes the human heart so that each person might better change the world. This Spirit fuels the work for which Friends are most known.