When most people use the word depression, they're talking about a normal mood that contains elements of sadness and unhappiness. Clinical or major depression is much more overwhelming. To sufferers, it can feel like the strongest force in the entire world, with hopelessness dominating their outlook to the point where they may no longer be able to continue performing the functions of day-to-day living. And while it occurs episodically, those who have suffered through a depressive episode are likely to have a relapse at some point in their life.Mindfulness-based cognitive therapy borrows from Buddhist meditation, asking people to observe their thoughts dispassionately...