Dane Ortlund asked several prominent pastors and theologians to write what they understood the Bible to be about in just one sentence.
I really liked this one from Doug Wilson:
Scripture tells us the story of how a Garden is transformed into a Garden City, but only after a dragon had turned that Garden into a howling wilderness, a haunt of owls and jackals, which lasted until an appointed warrior came to slay the dragon, giving up his life in the process, but with his blood effecting the transformation of the wilderness into the Garden City.
Read the rest here. They are very edifying!