In ‘Two Notions of Being: Entity and Essence’ E. J. Lowe defends “serious essentialism”. Serious essentialism is the position that (a) everything has an essence, (b) essences are not themselves things, and (c) essences are the ground for metaphysical necessity and possibility. Lowe's defence of serious essentialism is both metaphysical and epistemological. In what follows I use Lowe's discussion as a point of departure for, first, adding some considerations for the plausibility of essentialism and, second, some work on modal epistemology.