How far, how long?

The morning Sun never rises
with a melancholy face;
many a seeds sprouting,
many a trees withering:
it  forgets the day's matters,
good and bad, while asleep!

Unlike brainless things,
we pile up everything in mind,
to be got burdened later
and to be a burden forever,
carrying our own weight,
besides our worries' weight 
of tomorrows added on each day,
forgetting to live lively todays
to be a victim of unsure morrow's!
But how far and how long?