The Light of Stars
Venus vs. Mars
Venus is the 'star of love'—but it's not visible tonight. Mars gets the watch instead. Longfellow's switching from romance to warfare.
Military imagery
Mars wears 'mailèd' (chain mail) armor. The planet's reddish glow becomes a warrior's hand gesture, beckoning the speaker to endure.
Internal astronomy
The cold starlight from line 6 now mirrors his emotional state. He's mapping the night sky onto his own chest—no warmth, just resolve.
Stoic virtues
Four adjectives in a row: serene, resolute, still, calm, self-possessed. This is the Roman ideal of *gravitas*—Mars as philosophy, not just war god.
Psalm structure
He calls it a 'psalm'—a sacred song of instruction. The shift to 'thou' makes this a sermon, not just personal meditation.
Suffering as sublime
'Sublime' meant elevated, awe-inspiring—the aesthetic category for mountains and storms. He's making endurance into high art.