Eva Cassidy - What a wonderful world.
This is the last song that Eva sang in public (from a wheel chair) before an audience of friends, family and fans in September 1996, before she finally succumbed to cancer and died.
If we could only see beyond our depression, we will see that there is much that is good in this world.
YouTube - What a Wonderful World
That's the thing about depression: A human being can survive almost anything, as long as she/he sees the end in sight. But depression is so insidious, and it compounds daily, that it's impossible to ever see the end.
The most important things to do in the world are to get something to eat, something to drink and somebody to love you.