There is no safe investment. To love at all is to be vulnerable.
Love anything, and your heart will certainly be wrung and possibly be broken.
If you want to make sure of keeping it intact, you must give your heart
to no one, not even to an animal. 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, impenetrable, irredeemable.

....by C.S. Lewis
The Four Loves, p. 169