In the same way pain can indicate something is wrong with our body, depression indicates something is wrong with our psyche. Lifestyle changes have helped me, but reasoning about the pain, trying to release it to God, and getting my life right have also helped. An older Catholic told me mental illness increased dramatically when people stopped going to confession regularly. Looking back, a lot of my depression came from guilt, and still does. Ignoring and rationalizing the guilt by believing free will did not exist did not help, it just made me unable to accept responsibility and fix the problems in my life.