St. Francis Xavier went out into the world to proclaim the Gospel. St. Therese Martin lived in a convent but offered up her sufferings for missionaries. They are both the Patrons of the missions.
"By our little acts of charity practiced in the shade we convert souls far away, we help missionaries, we win for them abundant alms; and by that means build actual dwellings spiritual and material for our Eucharistic Lord." St. Therese of Lisieux