Context: Zephaniah prophesied in Judah during the reign of Josiah (640–609 BC), before the great religious reform. The book is dominated by the theme of the "Day of the Lord" — the most intensely apocalyptic theme of all the minor prophets. The medieval Latin hymn "Dies Irae" (Day of Wrath) was directly inspired by the language of Zephaniah 1.

Cosmic judgment (ch. 1): "I will utterly sweep away everything from the face of the earth" (1:2–3). The judgment encompasses the syncretic priests, those who worship the host of heaven, those who mix the worship of YHWH with Baal worship. The call to silence before God — "Be silent before the Lord God!" (1:7) — is of a crushing solemnity.

The turning point (ch. 3): After the judgment of nations and Jerusalem, Zephaniah 3:17 offers one of the most tenderly beautiful declarations in all of the OT about the love of God: "The Lord your God is in your midst, a mighty one who will save; he will rejoice over you with gladness; he will quiet you by his love; he will exult over you with loud singing." God does not merely endure his people — he sings over them with joy.