In this paper, I examine Anne Conway’s ‘argument from love’ in her Principles of the Most Ancient and Modern Philosophy. This argument, supported by a further argument, the ‘argument from pain’, undermines the dualist dichotomy between mind and matter by appealing to a vitalist similarity principle. My goal is two-fold: first, to contribute to a close systematic reconstruction and analysis of Conway’s arguments, which so far is largely lacking in the literature; second, to to show that these arguments are richer and more compelling than commentators have thought.