Sometimes, the biggest threats aren't external enemies, but the ones we allow to linger within. This verse paints a vivid picture of how that plays out.
More Than Just Physical Threats
The 'inhabitants' left behind weren't just a physical threat; they represented a spiritual danger. They would seduce Israel into idolatry, sexual immorality, and other practices that would incur God's wrath.
The Internalization of Trouble
The imagery of 'barbs' and 'thorns' suggests that the trouble wouldn't just come from external interactions. It would become an internal struggle, a constant source of vexation and distress. Allowing these influences to remain meant inviting ongoing conflict and hindering the promised peace and possession of the land.