The main lesson of the Book of Joshua is:
Faithful Obedience Leads to God’s Blessing and Victory
Joshua teaches that when God’s people trust Him and obey His commands, He goes before them, fights their battles, and gives them victory—even against overwhelming odds. The book highlights that:
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God is faithful to His promises (e.g., giving Israel the land of Canaan).
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Obedience brings success, while disobedience (like Achan’s sin) leads to defeat and consequences.
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Courage and strength come from trusting God, not from military might or personal power.
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God’s presence is key—the repeated phrase “I will be with you” reassures Joshua and the people.
Ultimately, the Book of Joshua encourages readers to live with courage, faith, and obedience, knowing that God’s promises are sure for those who follow Him.