Travel is fatal to prejudice, bigotry, and narrow-mindedness.
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Don't reward bad behavior. It is one of the first rules of parenting. During the financial cataclysm of 2008, we said it differently. When we bailed out banks that had created their own misfortune, we called it a 'moral hazard,' because the bailout absolved the bank's bad acts and created an incentive for it to make the same bad loans again.
I learned so much in Zimbabwe, in particular about the need for humility in our ambition to extend mental health care in countries where there were very few psychiatrists and where the local culture harboured very different views about mental illness and healing. These experiences have profoundly influenced my thinking.