What does the name even mean? A missionary is someone who brings God to those who do not have him. Long ago missionaries came to evangelize those living in both North and South America. They risked their lives (and very often lost them) to bring God to those people. Charity is also called love. So the missionaries of charity are, by their name, people who bring God to others through love. Mother Teresa once said that all are called to be missionaries of charity, and I am inclined to agree.
All people have a vocation. We are all here for a purpose which God has given to us. When we find it we must give everything we are to fulfill this vocation. This complete gift of self is love, and therefore a vocation is in and of itself love. Because of this we all have the base vocation to love. If we work at it and become a loving person, we will desire to spread this love of God to others. We will not be able to keep it to ourselves and therefore we must spread love of God to every person we can. So by finding our vocation and becoming a loving person, we will become a “missionary of charity” by necessity. No matter our vocation, whether it be priesthood, religious life, married life, or single life, we are all called to be missionaries of Charity, to bring God into the world through His love. We are called to be, “missionaries of charity.”