Not hokku, not even great poetry, but it has something to teach us nonetheless. I came across it many decades ago, and am not even sure precisely where:
Once little cares annoyed me
When life’s little cares were few;
And the one fly in the ointment
Put me in an awful stew.
But life’s stern troubles taught me
Each little good to prize.
I rejoice to find some ointment
In my little jar of flies.
HOKKU 