All your strength is in your union.
All your danger is in discord;
Therefore be at peace henceforward,
And as brothers live together.

These lines are spoken as counsel urging reconciliation and solidarity, framed in Longfellow’s characteristic use of verse to deliver moral and civic instruction. They come from his narrative poem “The Song of Hiawatha” (1855), in which Longfellow adapts (and freely romanticizes) Indigenous North American traditions for a 19th‑century American readership. The sentiment reflects a broader mid‑century preoccupation with social cohesion—within communities, between factions, and, by implication, within the nation—expressed through the image of “brothers” living in peace. In the poem’s dramatic setting, the lines function as a warning that internal division invites vulnerability, while unity provides collective strength.

The passage frames solidarity as a source of collective power and survival: “strength” comes from union, while “danger” arises from internal division. Longfellow’s antithesis (union/discord) turns a practical warning into an ethical imperative—peace is not merely the absence of conflict but an active choice to live “as brothers.” The lines suggest that shared identity and mutual obligation are prerequisites for stability, whether in a family, a community, or a nation. The moral logic is communal rather than individualistic: personal grievances must yield to the larger good, because internal strife makes a group vulnerable to external threats and self-destruction.