Cloudscape

… but you can hardly stand it though.
By now you know
It's not going to stop
Till you wise up."

Depression is caused largely by a hate for either oneself or for one's life -- these are one and the same because one's life is part of oneself; it is part of one's own qualia. It follows that only when one hates oneself, one will suffer, and hate is a craving to make someone suffer. Essentially, one gets what one wants. Similarly, any negative feelings at all are caused by anger at oneself or one's life, be it at a conscious or more subconscious level, and the opposite also counts: "Happiness does not depend on outward things, but on the way we see them." — Leo Tolstoy

Every feeling you have, you either choose for at the moment or at some earlier time. You ordered it, so to say, like a package.