What Is Purity Of Heart
Purity of heart means being righteous and being free of evil thoughts. Good thoughts are a requisite for good deeds, so the purity of the heart would imply being morally upright and striving to become like Christ through a strong sense of justice and by being helpful, humble, charitable, truthful, and not trying to inflict harm on others.
Even those who have transgressed can mend their sins by showing repentance. Only the innocent and repentant will enter the kingdom of God, as this is a sign of a pure heart.