But the most valuable lesson I’ve learned in the past couple of years is that all opinions are not created equal. Not everyone’s opinion matters. We’ve all got different voices yelling at us—real ones, and ones inside our head—and we get to choose whose voices get through. Choose wisely. Ignore the voices that don’t matter. You know whose they are."
-- From Another Mother Runner's interview with Jennifer Graham, whose book I'm going to have to buy.