I would like finally to mention another key expression of the
“secret” which has become justly famous: “my Immaculate
Heart will triumph”. What does this mean? The Heart open to
God, purified by contemplation of God, is stronger than guns
and weapons of every kind. The fiat of Mary, the word of her
heart, has changed the history of the world, because it brought
the Saviour into the world—because, thanks to her Yes, God
could become man in our world and remains so for all time.
The Evil One has power in this world, as we see and experience
continually; he has power because our freedom continually lets
itself be led away from God. But since God himself took a human
heart and has thus steered human freedom towards what is good,
the freedom to choose evil no longer has the last word. From that
time forth, the word that prevails is this: “In the world you will
have tribulation, but take heart; I have overcome the world”
(Jn 16:33). The message of Fatima invites us to trust in this promise.
Joseph Card. Ratzinger
Prefect of the Congregation for the Doctrine of the Faith