This isn't a poem, but someone just sent it to me, and I figured I'd stick it here.
......................
Meaning is not something you stumble across, like the answer to a riddle or
the prize in a treasure hunt.
Meaning is something you build into your life. You build it out of your own
past, out of your affections and loyalties, out of the experience on
humankind as it is passed on to you, out of your own talent and
understanding, out of the things you believe in, out of the things and
people you love, out of the values for which you are willing to sacrifice
something. The ingredients are there. You are the only one who can put them
together into that pattern that will be your life. Let it be a life that has
dignity and meaning for you. If it does, then the particular balance of
success or failure is of less account.
John Gardner