How does God justify sinners?

According to the sermon, God justifies those who are humble and acknowledge their need for mercy. This is illustrated in the parable of the Pharisee and the tax collector in Luke 18:14, where Jesus notes that the tax collector went home justified because he humbly admitted his sinfulness, praying, 'God, be merciful to me, a sinner.' Justification comes through faith in Christ, emphasizing that it is not the self-righteous who receive God's grace, but rather those who recognize their sinfulness and seek His mercy.