Last November, John Tierney in the New York Times wrote a great piece titled, When the Mind Wanders, Happiness Also Strays. The article, without mentioning it, gave great support for the need to cultivate sustainably strong attention with methods such as mindfulness meditation.
In essence, a mind that wanders easily is open to stray thoughts, much like a wound is open to infection. The focused mind, however, is completely engaged with what one is doing, ie. fully present, and, in a sense, effectively guarded from intrusively negative thoughts that might dampen one’s mood.
Always inspiring to see the social sciences supporting the motivation for mindfulness.