You have seen so much of the outer world and had so many experiences of people, places, and things—and of course those experiences will keep coming. But now, in the second half of your life, as the outer world seems more unstable and dangerous than ever, we want you to take the same rapacious curiosity that once thrust you all over the planet with a hungry, fascinated appetite, and we want you to turn it inward.
Eliminate something superfluous from your life.
Break a habit.
Do something that makes you feel insecure.
Carry out an action with complete attention and
intensity as if it were your last.