Answer:
I am the first you ever saw, what greets you every morning and what goes out in the end.
An image taken from real life
If you have me, you want to tell me. If you tell me, you don't have me.
What is yours but only used by others?
Angels and pilots earn these.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.