Being sad, depressed, nihilistic and defeated is a human condition that is familiar to everyone - but it is necessary to distinguish between occasional and manageable hardships and between serious forms of depression, bipolar disorder and other conditions that threaten an individual's life. If you are sad for a long period of time, lose interest in things you used to enjoy, have trouble sleeping, and/or have suicidal thoughts, then you should seek professional help. If it is a short period of grief, you can try to expand your world and thoughts with the Focus-Wheel method.