"The Black Heralds" revolves around life and experience being boiled down to a nice, swift kick in the pants. We poor humans can't get a break, and life really weighs us down, if you listen to this poem. Let's just say that if Eeyore had a favorite poem, this would probably be it.
The poem's only conclusion is that life is not worth living. Bad times.
Even though the poem only sees suffering, it still believes in humanity, and that life is worth living. Good times!