Why should Christians avoid a spirit of self-righteousness?

Christians should avoid a spirit of self-righteousness because it detracts from the glory of God's grace and leads to spiritual deception. As the sermon mentions, when we inspect our own works for assurance, we are often met with discouragement or false comfort, as true righteousness is found only in Christ. Philippians 3:9 states that we desire to be found in Him, not having our own righteousness, but that which is through faith in Christ. Self-righteousness can create division and conflict within the body of Christ, for it fosters pride and judgmental attitudes. Instead, we are called to cling to the righteousness of Christ, who alone provides our justification and assurance.