Do you remember the story of Joshua from the Bible? The one where the Israelites, led by Joshua en route to Canaan, march around the city of Jericho for seven days until its grand walls collapse? It’s a story of perseverance, certainly, but also, for the folks in Jericho, one of caution. No matter how well you fortify the world around you, strong walls don’t really mean much if they’re flimsy and sieged by forces greater than you. The best defense is a good offense, after all.