Harmony is used to support the melody by using chords. The harmony brings the music into place because of the chords that is used. These chords varies its melody depending on how high a chord is or how low it is. Together with that chord, brings the sound.
Nthe documentary, michael tilson thomas suggests beethoven's overall message in this symphony by stating, "things happen to us in life we can never get over, but it's ok to know that, recognize that and by confessing that easily and generously we perhaps become the biggest possible we can be."