High Quality Content by WIKIPEDIA articles! Christian missionary activities often involve sending individuals and groups, called "missionaries", to foreign countries and to places in their homeland for the purpose of proselytism. This involves evangelism (conversion to Christianity), and humanitarian work, especially among the poor and disadvantaged. Missionaries have the authority to preach the Christian faith (and sometimes to administer sacraments), and provide humanitarian work to improve economic development, literacy, education, health care, and orphanages. Christian doctrines (such as the "Doctrine of Love" professed by many missions) permit the provision of aid without requiring religious conversion.