Stein’s Freedom and Grace (Freiheit und Gnade) phenomenologically describes the experience of grace as the desire, communication, or acceptance of God’s Spirit of Love, accessed in the act of faith motivated by the soul’s otherwise unfulfilled desire for self-mastery. This article first discusses the affordances of Stein’s phenomenology which equip her to see grace as a fulfilment of the natural life of the soul, which is experienced as coming from beyond itself. It then addresses how the individual, personal I fails to satisfy its implicit desire for rational and free action in the natural life of the soul and how, in contrast, its opposite, the graced, liberated life of the soul, allows it to, but not on its own, only through union with God’s Spirit. It proceeds from this existential alternative to show how the treatise unfolds as an investigation of the various a priori possibilities for grace to be experienced and why it makes sense to acknowledge faith as a legitimate source of knowledge, as Stein does in work postdating Freedom and Grace. Finally, it is argued that the treatise is phenomenological in nature and that it does not presuppose either metaphysics or Christian doctrine but instead contributes to underpinning both. This argument simultaneously explains Stein’s own subsequent engagement as a Christian philosopher.