Answer:
What flies forever, Rests never?
What grows in winter, dies in summer, and grows roots upward?
We travel much, yet prisoners are, and close confined to boot. Yet with any horse, we will keep the pace, and will always go on foot.
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.
What word is the same written forward, backward and upside down?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?