Frost treats blood as an ancient force that no barrier can hold for long. Each time humanity believes it has safely impounded violence behind laws, treaties, or walls, the pressure builds until it bursts out in some fresh slaughter. The speaker rejects the easy claim that the devil lets it loose, pointing instead to blood itself, held at an unnatural level and demanding release. Weapons of war and even peacetime tools become mere outlets. As the image shifts from dammed flood to tidal wave, the mood turns grim, weary, and fatalistic. The closing line, “blood will out,” feels less like a proverb than a cold admission: violence keeps returning, and even the highest places are left stained. There is no easy comfort here, only recognition.
The Flood — Summary
Blood has been harder to dam back than water. Just when we think we have it impounded safe Behind new barrier walls (and let it chafe!), It breaks away in some new kind of slaughter. We choose to say it is let loose by the devil; But power of blood itself releases blood. It goes by might of being such a flood Held high at so unnatural a level. It will have outlet, brave and not so brave. Weapons of war and implements of peace Are but the points at which it finds release. And now it is once more the tidal wave That when it has swept by leaves summits stained. Oh, blood will out. It cannot be contained.