Choir by Henry Wadsworth Longfellow

It means "Rising in the night, let us all keep watch." This line opens a Benedictine monastic hymn that is sung at Matins, the prayer service that takes place during the night.

He didn't write the Latin — he quoted it directly from a hymn that's over 1,300 years old. This is the entire poem as presented here. By allowing these ancient words to speak for themselves, he shows that some calls to devotion don’t require modernizing or rephrasing.

It introduces this as the first part of a planned multi-part choral or devotional sequence. You can think of it as the first movement of a musical piece — suggesting that there's more to follow and inviting the reader or singer into a continuing performance.

At its core, it invites a group of people—a choir, a congregation, or really anyone—to rise in the night and share a vigil. On a larger scale, it emphasizes the importance of being watchful together, remaining attentive during challenging or dark moments.

Yes, in both its origins and its form. The Latin stems from a Christian monastic tradition, and the practice of rising at night to pray is particularly Benedictine. However, Longfellow's portrayal as a "Choir" piece broadens its appeal to any group united in a common purpose, not solely a church congregation.

The brevity is intentional. A choir call doesn't have to be lengthy — it simply needs to be clear and powerful enough to capture everyone's attention. This conciseness also honors the original Latin: Longfellow isn't trying to outshine it; he's showcasing it.

The main themes are faith (the devotional and liturgical atmosphere), community and togetherness (the emphasis on omnes, "all of us"), and hope (the act of keeping watch suggests a belief that the night will be worth enduring). There is also a subtle thread of courage in the choice to rise when staying asleep would be easier.