The Change, part I

I came across this lately, a nice one really -

When things go wrong, as they usually will
and the daily road seems all uphill
when machines are down and tempers high
you try to smile but can only cry
and you really feel you would like to quit

... you never can tell know how close you are
it may be very near though it seems so far.

So stick to the fight when you are the hardest hit
It's when things seem worst that you must not quit.

But one is some times forced to think, why does the daily road "seem" uphill? What triggers this "change" in the life? Though exceptions always exist, is the road indeed uphill?...