Thought is a mental process which allows an individual to model the world, and so to deal with it effectively according to their goals, plans, ends and desires. However, we are at the mercy of the mind that make us happy or depressed person. With meditation one can control mind.
The Vishvas Foundation has published an interesting article :
When we are afflicted with a disease like malaria, we don’t treat each symptom like fever, pain and shivering, one by one. We just treat the disease and the symptoms automatically vanish. So deal directly with the mind and symptoms like stress and strain will disappear. Vishvas meditation is mind management.