How do we know Christ is our only righteousness?

The sermon highlights that only the righteousness of Christ measures up to God's perfect standard. As stated in the content, we are all sinners and cannot attain righteousness on our own. Instead, as Paul explained, our righteousness must come through faith in Christ, as mentioned in Philippians 3:9, where he expresses his desire to be found in Christ, not relying on his own righteousness. Christ is portrayed as the perfect stone, the only one that can balance the scales of justice before God.