2. Since this precious human life can be used in powerfully beneficial or destructive ways, and is itself most fragile, make good use of it now.
3. Physical happiness is just an occasional balance of elements in the body, not a deep harmony. Understand the temporary for what it is.
4. A tamed mind makes you peaceful, relaxed, and happy; whereas, if your mind is not peaceful and tamed, no matter how wonderful your external circumstances, you will be beset by frights and worries. Realize that the root of your own happiness and welfare rests with a peaceful and tamed mind. It is also a great benefit to those around you.
--from Mind of Clear Light: Advice on Living Well and Dying Consciously by His Holiness the Dalai Lama, translated and edited by Jeffrey Hopkins, Ph.D.