C. S. Lewis put it like this,
‘Love anything and your heart will be wrung and possibly broken. If you want to make sure of keeping it intact, you must give it to no one, not even 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. To love is to be vulnerable.’
There is no way to have a real relationship without becoming vulnerable to hurt. And Christmas tells us that God became breakable and fragile. God became someone we could hurt. Why? To get us back. And if you believe this and take it into your life, you’re blessed. As you take in the truth of what he did for you—how loved and affirmed you are—you’ll be able to let down your defenses in your own relationships with other people. You won’t always need to guard your honor. You’ll be able to let down the barriers down. You’ll be able to move into intimate relationships with other people.
What is in the package of Christmas? His vulnerability for intimacy with us, which gives us the vulnerability to be intimate with the people around us. If you believe in Christmas—that God became a human being—you have an ability to face suffering, a resource for suffering that others don’t have.
– Tim Keller