To love at all is to be vulnerable. Love anything, and your 
heart will certainly be wrung and possibly broken. If you 
want to make sure of keeping it intact, you must give your
heart to no one. Wrap it carefully round with hobbies and
little luxuries; avoid all entanglements; lock it up safe in 
the casket or coffin of your selfishness. But in that casket—
safe, dark, motionless, airless— it will change. It will not
be broken; it will become unbreakable, inpenetrable, irredeemable.