The Dalai Lama has repeatedly emphasized that inner discipline is the basis of a spiritual life. It is the fundamental method of achieving happiness. As he explained throughout this book, from his perspective inner discipline involves combating negative states of mind such as anger, hatred, and greed, and cultivating positive states such as kindness, compassion, and tolerance. He also has pointed out that a happy life is built on a foundation of a calm, stable state of mind.

— Dalai Lama

from The Art of Happiness