Answer:
Timid or weak people are said to not have these.
What's always coming, but never arrives?
I am the red tongue of the earth, that buries cities.
You can't keep this until you have given it. What is it?
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
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.