We want to manifest our love and gratitude to the Blessed Virgin by making a fourth vow – slavery to Mary according to Saint Louis-Marie Grignion de Montfort – so as to obtain her indispensable help to prolong the Incarnation in all things.
This fourth vow (the first three are chastity, poverty and obedience) it is done in the first year of formation, in the year of novitiate.
To achieve this disposition of maximum, total and unrestricted docility to the Holy Spirit, the Spirit of Christ,26 we need the Holy Virgin Mary to be the model, the guide and the form of all our actions. For by this means can we say with all the strength of soul and heart, today and always, “Totus tuus” Mary! (const. 19)