After Moses' death, Joshua was scared and intimidated by the weight of responsibility he had assumed as Moses' successor. God spoke to Him and assured him that there was no need to be afraid, since God was with Him.
http://biblegateway.com/passage/?search=Joshua%201:9&version=NIV
Topics: Moses, Joshua, Discouraged, Do Not Be Afraid, Be Strong, Strong And Courageous, Do Not Be Discouraged
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