In the context of the Israelites entering the Promised Land, God allowed some of the native nations to remain. This decision served a dual purpose: it was a test of the Israelites' faithfulness and a practical means to teach warfare to a new generation. Many of the Israelites had not experienced the battles their ancestors had faced, so they needed to learn the skills necessary to protect their land and people. This period of learning was crucial for their survival and success in the land God had promised them.
The verse underscores the idea that challenges and adversities can be opportunities for growth. By facing these nations, the Israelites would learn not only military tactics but also reliance on God for strength and victory. It teaches that God can use difficult situations to prepare us for future challenges, building our character and faith. This principle is applicable to our lives today, reminding us that God can use our struggles to teach us important lessons and help us grow stronger in our faith and abilities.