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But why 40 years? Why were still so disobedient after all that time that they couldn't have all the Lord's promised blessings? They lusted after the food and security of Egypt (Exo 16:3). They brought the idols of Egypt with them. In other words, they couldn't stop thinking of home.
As a Missionary for the Church of Jesus Christ of Latter-Day Saints, I have left home and its comforts, and I sometimes feel like I'm wandering around an unwelcoming and bitter desert. I miss my Mommy on those days, and I want to return to my Egypt (home) where things were safe and comfortable.
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Its hard to continually put our faith in Christ so that he can lead us. And its harder still to do that over and over again. But I think that is what faith is, even when we doubt or fear, we still go forward, forward in faith. I think the Lord said it best to Joshua, "Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the Lord thy God is with thee whithersoever thou goest" (Josh 1:8)