In this shiur, delivered on Tisha B'Av in NCSY Kollel, Rav Burg explains the nature of walls. Walls ought designed to protect our dignity. But when we live with a scarcity mentality, a mentality of fear, we build walls that imprison us from ourselves and from others. When we build healthy walls that protect our dignity and invite each other in, then we will merit to rebuild the walls of Yerushalayim Habenuyah.