Be daring, and have recourse to Mary
Do you want to be daring in a holy way, so that God may act through you? Have recourse to Mary, and she will accompany you along the path of humility, so that, when faced by what to the human mind is impossible, you may be able to answer with a fiat! — be it done!, which unites the earth to Heaven.
St. Josemaria Escriva (Furrow 124)