Answer:
The line a runner strives to reach
Cycle Cycle Cycle.
As strong as love, more dangerous than cancer.
What hangs in the sky by day but at night goes away?
What do cheetas, dalmatians and appaloosas have in common?
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.