Long ago I was told a story, which is now probably corrupted in my mind, that makes a good illustration of the relationship between rules and freedom in Christianity.
It goes something like this: a family's house has a backyard that ends in a cliff. The child, playing in the backyard, is afraid of the cliff, and therefore stays near the house. However, when a fence (think "rules") is erected around the perimeter of the backyard, the child experiences freedom to play throughout the whole yard. Moral: the truth can set us free.
I originally thought that this story was owed to C. S. Lewis, but now I cannot track it down. Who authored this idea?