Earlier in the year Jonah Lehrer explained in the New Yorker how cool deferred gratification is and how we need to teach it to our kids, the younger the better. Now, in the New York Times, John Tierney suggests that it's really an insidious habit for grownups, sacrificing real enjoyment for the mirage of an even better future. Can everything good be bad for you? Of course the respective sets of behavioral research described might be consistent. Children who master delaying pleasure become superior achievers and thus have the frequent flier balances that they are so counterproductively hoarding. The same...