Shall the ax boast itself against him who chops with it? Or shall the saw exalt itself against him who saws with it? As if a rod could wield itself against those who lift it up, or as if a staff could lift up, as if it were not wood!
Isaiah 10:15
One of the dangers in the Christian life is to take credit for what God does. This was the Assyrians’ problem. They were a weak nation until God chose to bless them in order to use them as an instrument to punish the Israelites. However, the more God blessed them, the more confident they became in their own strength. When the farmers had good crops, they credited their farming skills rather than God. When their army won a victory, their generals took the credit.

