A very encouraging commentary on Joshua. I've read several of Wiersbe's books in this series. I like the history and background that he adds and his insights on what's happening and how to apply the lesson to our lives.
In Joshua 2, Wiersbe says God brought Israel out of Egypt to go into the Promised land in Canaan (Deuteronomy 6:23). God then asked His people to follow His instructions for crossing the Red Sea. The priests had t get their feet wet before God parted the waters for them (Joshua 3:14-17). Wiersbe presents this lesson as a question: Are you an overcome or are you overcome by your circumstances and unbelief in God's words and promises?
In chapter 4, Wiersbe talks again about how overcoming comes before victory (1 John 9:4). God brought Israel out of Egypt, warned them about sin, tested their obedience, then removed the reproach of Egypt by having His people cross the Jordan like a baptism and renewal (Deut. 30:6, Jeremiah 4:4, Joshua 5:8-9).
Joshua is an example of someone who followed God's instructions. He believed God and overcame by fighting as God instructed him to. Joshua followed God's orders, he didn't do things on his own. After the defeat at AI, Wiersbe pointed out how Joshua handled the failure. He sought God, asked why it happened, accepted God's rebuke and correction, confessed sin, and let God cleanse the tribes and camp. Wiersbe said that no defeat is permanent if you seek God and repent.
After the cleansing, Joshua started again with God's instructions. He heard God and believed His words. Joshua said several times that God keeps His promises.
Unbelief was a problem for Israel. Achan stole banned items. The tribes of Reuben, Gad and Mannasseh didn't go into land, but stayed east of it. The tribes in the land didn't drive out the enemies completely though God gave them the land and promised victory. In chapter 24, Joshua said the people weren't serious about commiting to God. He said their sin was a barrier that kept them from serving God fully as Joshua and Caleb did (Joshua 24:14-28).
I think this commentary helped me sees themes and understand the text more than I could on my own.