This article examines the question of whether the created human nature, or fiṭra, is portrayed as mutable in Shāh Walī Allāh's (d. 1762) Ḥujjat Allāh al-Bāligha. I argue that Walī Allāh uses the fiṭra — or the perfection of four qualities that make for human flourishing — to anchor a unified concept of human perfection that can fit different ages without essentially changing. Walī Allāh accomplishes this by affirming the particularity of divine laws and the efficacy of local customs in realising the eternal demands of the human form. More specifically, he posits that established practices can become second nature to a community, enter the divine system of requital, and thus help a people develop the necessary qualities through highly contingent means, all without violating the Qur'anic and traditional claim that the original nature itself never changes. With recourse to some of his other works and potential influences, I conclude that Walī Allāh's conception of the fiṭra accommodates traditional theological assertions regarding the singularity of human perfection, on the one hand, and the possibility of reformed norms, on the other.