A poem begins with a lump in the throat; a homesickness or a love sickness. It is a reaching-out toward expression; an effort to find fulfillment. A complete poem is one where an emotion has found its thought and the thought has found words.
Robert FrostNature's first green is gold, Her hardest hue to hold. Her early leaf's a flower; But only so an hour. Then leaf subsides to leaf. So Eden sank to grief, So dawn goes down to day. Nothing gold can stay.
Robert Frost