" Sometimes it might be hard to let yourself have a good experience. So consider “the friend test.” If your friend could have a positive experience, would you wish that for him or her? Would you want your friend to be able to enjoy the experience and to take it in? Well, it is equally valid to wish to have positive experiences yourself. You’re not looking at the world through rosetinted glasses, but rather correcting your brain’s tendency to look at it through smog-tinted ones. And by taking in the good, you become more able to deal with the bad. This doesn’t mean putting on a happy face if you feel stressed or let down. But when you have the opportunity, why not let yourself feel good, and grow more strengths inside? "

― Rick Hanson , Hardwiring Happiness: The New Brain Science of Contentment, Calm, and Confidence