Why is self-righteousness a problem for believers?

Self-righteousness is a pervasive issue because it fosters pride and a false sense of security. Jesus repeatedly warned against this attitude, particularly in the Pharisees, who thought they could earn God's favor through their adherence to the law. Romans 2:19 explains that the hypocrite, confident in their own righteousness, often despises others, unaware that they, too, are transgressors. Such pride can alienate individuals from the grace of God, as they fail to recognize their dependence on Christ for all righteousness.