This essay explores a certain kind of uncertainty, a fuzziness, that occurs in interreligious study where the religions involved both highly prize clarity, truth, and specific commitments. Reading that crosses religious borders creates a body of new insights and even spiritual experiences that neither fit easily into the settled doctrines of traditions nor contest those doctrines by offering new, liberal, or relativizing alternatives. Rather, productive spaces open up wherein spiritual insight and uncertainty go hand in hand, created and accentuated by study, a stubborn fidelity to detail, and the ability to live with incertainty. By way of example, this essay offers an instance from a current study that the author, a Roman Catholic, is undertaking of intensely devotional medieval Hindu poetry, in part read along with passages from the biblical Song of Songs. The uncertainty carefully cultivated in this kind of study is, he argues, beneficial for those who remain committed to doctrinally robust traditions but also engage in the study of other, similarly robust traditions.