Our Sages consider the Sin of the Spies even worse than the Sin of the Golden Calf. What is the root cause of the sin of rejection of the Land of Israel? What is so terrible about "We will make a new leader and return to Egypt?" At the time of the sin, as Rashi explains, the spies were righteous Jews who had just experienced the myriad miracles of the Exodus from Egypt and the journey through the desert. Did they really believe that G-d could not humble the lowly Canaanites as He had the mighty Egyptian empire? How could...