Getting this one in now while I'm thinking about it... I love this song, and it shouldn't be hard to see why.

Sarah McLachlan - Prayer of Saint Francis

Lord, make me an instrument of your peace.
Where there is hatred let me sow love.
Where there is injury, pardon.
Where there is doubt, faith.
Where there is despair, hope.
Where there is darkness, light.
And where there is sadness, joy.

O divine master grant that I may
not so much seek to be consoled as to console,
to be understood as to understand,
to be loved as to love;
for it is in giving that we receive,
it is in pardoning that we are pardoned,
and it's in dying that we are born to eternal life.