How can the most intelligent politicians stumble upon the stupidest sex scandals? The problem is the decision fatigue. The more and more important decisions we make, the less we can resist temptations.
Positive thinking makes life easier, but the key to success is discipline. Fortunately, one can practice discipline by training one's willpower.
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When I was an adolescent in England, at school we had to read 'Death of a Salesman.' I remember feeling incredibly moved by the portrayal of these people and the idea with which Miller broached the whole subject of failure or failed systems, or the way that people are crushed by a system in which they find themselves.