If Joash had whole-heartedly obeyed the prophet, God would have greatly used him to conquer and destroy a nation that had plagued Israel. Instead, he only half-heartedly obeyed and he missed out not only on the blessing, but on being mightily used by God.
What things am I doing half-heartedly that God could greatly use if I gave my all to the task? Are there things in my life that I could've completely destroyed so my children wouldn't have to struggle with the same thing in years to come?
It's time for me to take up the arrows and strike the ground five or six times, whole-heartedly so that God can show Himself mighty through me.