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I go up, Though sometimes I am down. I can write, But I don't make a sound. I am the touchstone for lightness, But often I am black. I can help you to hit the sack.
Did you know the answer?
This puzzle is a poem (of sorts) that requires a six-letter word in each line. The six letters never change except in their order: "A ... sat on his ... grey, watching the ... of parting day, and this was his lay: 'Thou ... the weak, Thou ... the strong, to Thee the ... of battles belong.' And the wind with a ... bore off his song."