Shared ground
Nahum 1:7–8 sets two truths side by side. Explicitly, Yahweh is described as good and as a “stronghold” when trouble comes. The text also says he knows the ones who take refuge in him—language of attention and recognition, not detachment.
The same lines also explicitly describe Yahweh bringing decisive ruin: an “overflowing flood” image, a “full end” of “her place,” and the pursuit of “his enemies” into darkness. The passage does not soften either side; it holds refuge and sweeping judgment together.
Where interpretation differs (only where needed)
“Her place”: Some read this as Nineveh specifically, since the book targets Nineveh and later chapters describe its fall. Others take it more broadly as the oppressing power/seat of empire (Assyria), with Nineveh as the main symbol.
“Overflowing flood”: Some think the language points to an actual disaster (flooding) that contributes to the city’s collapse. Others read it as a vivid metaphor for an invading force that overwhelms defenses.
“He knows” and “darkness”: Some take “knows” to imply personal care that results in protection; others see it as God’s clear identification of who belongs to him (and therefore who will be spared). “Darkness” is commonly understood as defeat and removal from power, but interpreters differ on whether it points most directly to death, exile, or being wiped from the historical scene.
Why the disagreement exists
The passage uses compact poetry and images rather than detailed explanation. It names outcomes (refuge, full end, pursuit) but leaves key referents open (“her place”) and speaks through pictures (“flood,” “darkness”) that can be read literally or figuratively.
What this passage clearly contributes
These verses contribute a tight portrait of Yahweh’s character and action: goodness expressed as real refuge for those who flee to him, and unstoppable judgment against those designated as his enemies. The contrast (“But…”) is not between two different gods or moods, but the same Yahweh acting differently toward different parties in the conflict described in the book’s opening unit Nahum 1:1–8.