The opening of Hebrews describes the Son as the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word. The Greek word translated radiance is ἀπαύγασμα (apaugasma) — the shining-forth of a light, the effulgence that streams from its source while remaining one with it. It is a rare word, and where it comes from tells the reader a great deal about how the New Testament’s high Christology was built.

Apaugasma is almost absent from surviving pre-Christian Jewish literature. Nearly the only place it appears is Wisdom of Solomon 7:26, where Wisdom herself — God’s personified attribute, present at creation, the agent through whom the world was made — is described as a reflection of eternal light, a spotless mirror of the working of God, and an image of his goodness. The Wisdom of Solomon is a Hellenistic Jewish text written in Greek, probably in Alexandria, sometime in the first century BC or early first century AD. It drew on the Greek philosophical tradition and the Hebrew Wisdom tradition together to develop a portrait of divine Wisdom as the radiance of God. The author of Hebrews knew that book, and he reached for its word.

This is the move worth hearing. The writer of Hebrews took the categories the Jewish Wisdom literature had already prepared for describing divine Wisdom — radiance, image, the agent of creation — and applied them, with deliberate specificity, to Jesus of Nazareth. He was not inventing a vocabulary from nothing. He was drawing on language his readers’ wider Jewish library had spent generations developing. The same pattern shows in Colossians, where Christ is called the image of the invisible God, the firstborn over all creation, language from the same Hellenistic Jewish Wisdom tradition.

For the first audience, the echo was part of the meaning. A reader who knew the Wisdom of Solomon would have caught what apaugasma was doing the instant it was read: the word that had described God’s personified Wisdom was now describing a man who had lived and died in Galilee. The shock of the claim is sharper precisely because the word came pre-loaded. The New Testament’s deep Christology did not arise in a vacuum; it was assembled from terms the Jewish library had ready to hand.

The modern reader who knows only the canonical Old Testament hears radiance as a fine devotional metaphor and moves on. The reader who knows the room the New Testament was written in hears something more pointed — a rare Wisdom-word, borrowed on purpose, fastened to Christ. That is what the first audience heard.