“The quest for happiness has been the direct or indirect subject of a huge chunk of intellectual endeavor: philosophy, theology, psychology, economics and, of course, literature…”
In my view, yes one can train the mind to be happy in a similar way to training the body. Keep the mind turning away from unhappiness and keep turning it towards the positive and towards happiness. This is at first a very conscious effort. Like any habit it takes time to establish the habit of happiness.
New Your Times Art and Design article: