Answer:
I move without wings, Between silken string, I leave as you find, My substance behind.
A harvest sown and reaped on the same day In an unplowed field, Which increases without growing, Remains whole though it is eaten Within and without, Is useless and yet The staple of nations.
Runs smoother than any rhyme, loves to fall but cannot climb.
It holds no blessings in disguise. Its rhymes are aimed at your demise, it's cast only to ruin, Whatever you are doin'.
Just head and foot yet never tires of dancing.
I have two eyes in the front and a lot of eyes on my tail