Answer:
Jack and Jill when up the hill jack fell down
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
Iron roof, glass walls, burns and burns and never falls.
Glittering points that downward thrust. Sparkling spears that never rust.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
I have two eyes in the front and a lot of eyes on my tail