Inspiration

I just wonder about inspiration, and where it comes from.
at first glance happiness would appear to be a great source of inspiration, but it does not quite do it for me, I find anger, fear, confrontation, and suck feelings bring out more out of an artist, out of me. I am quicker to anger than to any emotion lately...
Its the one emotion the other ones can not muffle or even hide anymore. But it brings the pencil to my hand...