Answer:
What is that which, though black itself, enlightens the world without burning?
Plow and hoe, reap and sow, What soon does every farmer grow?
I have many feathers to help me fly. I have a body and head, but I'm not alive. It is your strength which determines how far I go. You can hold me in your hand, but I'm never thrown.
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.