The fuller, deeper meaning of a biblical text — intended by the Holy Spirit as the ultimate Author of Scripture — that goes beyond (but never contradicts) the literal, historical meaning grasped by the original human author. When David wrote "You will not abandon my soul to Sheol" (Ps. 16:10), he spoke of his own hope in God, but the Spirit embedded a fuller meaning — the bodily resurrection of Christ — that Peter unpacks at Pentecost (Acts 2:25–31). When Isaiah wrote of a virgin bearing a son (Isa. 7:14), the immediate referent was a sign to Ahaz, but the sensus plenior pointed to the Incarnation itself (Matt. 1:22–23). Sensus plenior is not reading into Scripture what isn't there — it is recognizing that the divine Author wove threads the human author could not yet see, threads that become visible only in the fuller light of redemptive history.
This Latin phrase does not appear in Webster 1828. Webster, however, understood the principle. Under "SENSE": "The meaning of a word or expression; the import, including the ideas which a word or sentence is intended to convey. Every word has one or more senses. The literal sense of a word is that which is expressed by the word directly; the figurative sense is remote." Scripture, uniquely among all texts, has senses that the Spirit intended but the human pen did not fully grasp — the fuller sense that history itself unveils.
Two equal and opposite errors attend this concept. First, liberal critics deny the sensus plenior entirely, insisting that a text means only what the human author intended — effectively stripping Scripture of its divine authorship and reducing it to ancient literature. Second, undisciplined interpreters abuse the concept to justify arbitrary allegorizing — finding "deeper meanings" that have no connection to the text's grammar, context, or redemptive arc. Both errors misunderstand divine authorship: God does not contradict the human author, but He sees further. The sensus plenior is controlled by canonical context, typological patterns, and apostolic precedent — not private imagination.
Acts 2:25–31 — Peter demonstrates that David's words in Psalm 16 carried a fuller meaning — the resurrection of the Messiah — that David himself "foresaw" but could not fully comprehend.
Matthew 1:22–23 — Isaiah's sign to Ahaz finds its fuller fulfillment in the virgin birth of Christ: "All this took place to fulfill what the Lord had spoken by the prophet."
1 Peter 1:10–12 — "The prophets…searched and inquired carefully…inquiring what person or time the Spirit of Christ in them was indicating when He predicted the sufferings of Christ and the subsequent glories."
Hosea 11:1 / Matthew 2:15 — "Out of Egypt I called my son" — Hosea's historical reference to Israel becomes, in Matthew's hands, a prophecy of Christ's return from Egypt.
Sensus plenior is why Bible reading never bottoms out. You can read a passage a hundred times and see something new — not because you're imagining it, but because the divine Author is deeper than any single reading can exhaust.
Understanding sensus plenior guards against both wooden literalism (refusing to see typological connections the apostles themselves made) and fanciful spiritualizing (seeing whatever you want in the text). The New Testament itself is the master class in how to read the Old Testament's fuller sense.