Tim Keller sermons via Gospel in Life: Christian peace is not the absence of troubles. It is a peace that is unshakeable even in the midst of troubles. During difficult times, Christians are called to remember the living God who works out all things for good for those who love Him. If we set our heart on anything besides God, we can lose our peace. But if our greatest love is the unchanging God, then our peace can never be taken from us.