There’s nothing harder in the entire world than changing your life. So few are successful at it that we sometimes wonder if it’s possible at all.

Why? Because we do not change our environment. Consequently, we are we are forced to rely entirely on willpower to get the job done. This approach is like fighting a land war in Russia: sure, you might be successful for a while, but winter is coming, and you are a long way from home. [ . . . ]