>Sadness tends to have a source. Depression does not. All depression has a source. Often we simply can not understand it (neither scientifically nor socially).

>Sadness tends to have a source. Depression does not. All depression has a source. Often we simply can not understand it (neither scientifically nor socially). When we do understand the source, it can lead to more effective treatment; such as better medication, or more effective lifestyle interventions. In the far future, we may entirely realistically be rid of depression entirely, if we learn to understand its sources.