David Livingstone is hailed as one of the greatest Christian missionaries of all time. That’s odd in a way, because he only had one convert in his entire career.
He wasn’t a great preacher and the London Missionary Society would have rejected him, but the director gave him a second chance to pass the course. In addition to this, he was a lousy leader and was incapable of organizing large-scale projects.
Livingstone lacked the gifts you would desire in a missionary, but you simply could not get this man to quit.