I got this quote in e-mail a couple of days ago, from the Beliefnet Buddhist wisdom newsletter:
At a time when people are so conscious of maintaining their physical health by controlling their diets, exercising and so forth, it makes sense to try to cultivate the corresponding positive mental attitudes too.
-His Holiness the Dalai Lama, 1963*
Cultivating mindfulness when it comes to our thoughts is more important than people think. You can be eating the healthiest foods in the world, but if you are cursing the world or yourself in your head, you at best not feel so good – or at worst, make yourself physically ill. So many people go around not understanding that we are one – body mind and spirit are all connected. If one is ill, it will affect the others. So it is important to eat healthfully and nurture yourself with good thoughts, too.
*From “The Pocket Dalai Lama,” edited by Mary Craig, 2002. Reprinted by arrangement with Shambhala Publications, Boston, http://www.shambhala.com.