When I was a kid, we had a swimming pool in the backyard. Three sides had a wooden privacy fence around it while the back had a regular height chain linked fence at the edge of our city lot. One day, we noticed the chained link fence had a dip in the top bar, and before much longer, we caught some kids sneaking in the pool over the fence. No matter how hard we tried to establish a definitive boundary for our swimming pool, we had people who tried to overstep.
Even though boundaries are overstepped at times, the importance of creating them is no less vital. Even God, when he created the world, set boundaries. Day and night. Earth and sky. Water and land. Male and female. Animals and humans. Boundaries are in the foundation and fingerprints of our entire existence.