Many people in Africa desired education, and missionaries taught them to read so that they might grasp God's word. The missionary explorer David Livingstone (1813–1873) felt that only a combination of Christianity and trade could end the slave trade. He tried to use his influence with kings to stop them from selling people into slavery, and some scholars believe that he succeeded in ending the practice altogether in some countries. Modern-day missionaries are called "evangelists." They go where Jesus sent them and spread the good news about Jesus Christ, who died on the cross for their sins and was raised from the dead by His Father. Evangelism is the most important thing that missionaries do. Sometimes they go alone into remote areas where there are no churches, but more often than not, they take fellow believers with them as helpers and/or support staff. Missionaries usually start out with little or no money and many times have to borrow funds to travel to far-off places where they can work with local churches to establish missions. But once the first missionaries were sent out from Europe, they made enough money to send others after them. This pattern continued for several years until virtually every European country had someone working among the Africans or Europeans living in Africa. By 1820 there were nearly 200 missionaries in Africa.