The most important lesson I ever learned was back in Thailand in 1997: that the biggest contributor to my unhappiness wasn’t external problems like being single or unemployed, but my own mental states like craving. Fixing those mental states was a surer path to happiness and reducing suffering.

But the question that has played an ever-increasing role in the three ensuing decades has been: okay, but how? It is one thing to recognize that your craving and anger – or fear or self-pity or shame or other negative emotions – are the main thing keeping you down. It is quite another to do something about them. Our animal natures make those states quite recalcitrant.