The stanza in the poem is actually differentiating heaves from earth which means that life on earth and life after-here is a firmament between earth and skies. Life on earth is where living things are born and in the heavens they go when their life is taken.
The stanza in the sonnet is really separating hurls from the earth which implies that life on earth and life after-here is an atmosphere among earth and skies. Life on earth is the place living things are conceived and in the sky, they go when their life is over.
Without people being equal, world wide battles will spread. Hate and cruelness will be inevitable, and perhaps become worse with time, moving through the people who did not expect it to come.