The sensus plenior argument maintains that biblical texts contain a "fuller meaning" (sensus plenior) intended by God that exceeds what the human authors consciously understood or intended to communicate. This hermeneutical principle posits a dual authorship of Scripture where the divine author embeds deeper theological significance that becomes apparent only through later revelation, particularly through Christ and the Church's tradition. The argument's inferential structure moves from observed instances of New Testament reinterpretation of Old Testament texts, through the premise of divine inspiration, to the conclusion that Scripture legitimately bears meanings beyond its original historical context. Proponents argue this explains how apostolic authors could discover Christological meanings in Hebrew Scripture that seem absent from the literal sense, while maintaining the text's divine authority and coherence across salvation history.
The concept emerged formally in mid-20th century Catholic biblical scholarship, though its roots trace to patristic and medieval exegesis. Andrea Fernández coined the term in 1925, but Raymond E. Brown's "The Sensus Plenior of Sacred Scripture" (1955) provided its systematic articulation. Brown argued that this meaning exists in the literal sense of Scripture but remains hidden until later revelation illuminates it. Joseph A. Fitzmyer refined the concept in "The Use of Explicit Old Testament Quotations in Qumran Literature and in the New Testament" (1961), distinguishing it from typology and allegory. Pierre Benoit's "La plénitude de sens des Livres Saints" (1960) explored its theological implications, while Bruce Vawter's "Biblical Inspiration" (1972) situated it within broader inspiration theology. The Second Vatican Council's Dei Verbum (1965) implicitly endorsed the principle without using the technical term.
Critics raise several objections. James Barr in "The Semantics of Biblical Language" (1961) argues that positing meanings unknown to human authors undermines historical-critical method and opens Scripture to arbitrary interpretation. Evangelical scholars like D.A. Carson in "Exegetical Fallacies" (1984) worry it compromises sola scriptura by making tradition necessary for discovering Scripture's meaning. Literary theorists question whether texts can bear meanings independent of authorial intention. Defenders respond that divine inspiration necessarily involves meanings transcending human awareness, that the New Testament itself models this hermeneutic, and that ecclesial tradition provides objective controls against subjective readings. They distinguish sensus plenior from allegorization by grounding it in the literal sense and requiring demonstration through canonical development.
Sensus plenior differs from related hermeneutical approaches in specific ways. Unlike typology, which sees persons or events as prophetic patterns, sensus plenior locates deeper meaning in the texts themselves. It diverges from the medieval four senses by remaining within the literal sense rather than adding spiritual layers. Unlike progressive revelation, which sees God revealing new truths over time, sensus plenior finds these truths already latent in earlier texts. It contrasts with canonical criticism's focus on final form by emphasizing divine intention throughout the compositional process.