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..... in our daily life a certain way of thinking makes us happy, and a certain way of thinking makes us unhappy. In other words, there are certain states of mind which bring us problems, and they can be removed; we need to make an effort in that direction. Likewise, there are certain states of mind that bring us peace and happiness, and we need to cultivate and enhance them.
--from Generous Wisdom: Commentaries by H.H. the Dalai Lama XIV on the Jatakamala