What does the Bible say about confidence in the flesh?

In Philippians 3, Paul warns believers against placing any confidence in the flesh, regardless of one's credentials or religious accomplishments. He emphasizes that all human efforts are worthless when compared to the surpassing worth of knowing Christ. Our righteousness is not derived from our adherence to the law but through faith in Jesus, who fulfilled the law on our behalf. Similarly, Galatians 5 underscores this point by cautioning against becoming entangled again in the yoke of bondage, pointing out that a little leaven leavens the whole lump, symbolizing the danger of relying on works for salvation.