Why is self-righteousness a problem for Christians?

Self-righteousness poses significant problems for Christians because it fosters a reliance on personal efforts instead of complete dependence on Christ's work of redemption. This condition arises when individuals attempt to establish their own righteousness, often through rigorous adherence to moral or religious standards, ultimately failing and leading to feelings of inadequacy and guilt. Paul Washer points out that although people may love the idea of perfectionism, they inherently know they fall short of God's holy requirements, which can result in a cycle of despair. Jesus summarizes this teaching in the Sermon on the Mount, highlighting the impossibility of self-justification and the importance of relying on God’s grace for our standing before Him.