Answer:
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
What is something you can give away as many times you want without ever losing it?
If it is absolute, it will corrupt absolutely.
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
Small, containing light, You'll need it in the dark, It will provide that spark, and shine into the night. Will light up any pyre, 'Cause it can help make a fire.
It is something you will never see again.