A standard prayer said by Catholics when they pray the Rosary is this:
Pray for us, O holy Mother of God, that we may be made worthy of the promises of Christ.
Note: we do not ask the Blessed Virgin to pray for us because we are worthy; we ask it in order that we may be made worthy. We pray this because we long to be worthy of Christ’s promises; we pray this because we understand that unless we receive grace to be worthy of them, we shall never be.
So much, once again, for the lie of our enemies that we think we can earn our way to heaven based upon our own merits.