Answer:
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
What do you fill with empty hands?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
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.
When is it bad luck to see a black cat?