At the end of this important phase in our 'Spiritual Exercises,' our Blessed Mother wishes to tell us that in our 'warfare' against the Evil One some of the principal weapons like prayer and fasting have effectiveness only if we pray and fast from the heart, that is, with utter conviction, involving our whole being, not just out of habit. This is how the greatest commandment was given by God: "You must love the Lord your God with all your heart, with all your soul, with all your strength" (Deuteronomy 6:5; Matthew 22:37).
The best motivation for doing something from our heart is doing it out of gratitude and love. We have every reason to be grateful to God for ever for giving us a wonderful Mother.