The drastic differences in levels of development between African and European nations, as evidenced by military artillery comparisons, have given way to the idea that Europeans were of a superior race to Africans. This feeling of superiority developed into a phenomenon known as the "Great White Burden." The burden of the Great White is the idea that it is the duty of Europeans, as the most “superior” race, to colonize Africa and teach Africans how to be “civilized.” This has given reason for individuals such as aid workers and religious figures to enter the continent. Missionary societies, of "all denominations" and "all European countries" at the time considered it their "divine mission" to convert Africans. These missionaries often gained acclaim from their sojourn in Africa, particularly David Livingston. Livingston wrote an account describing his experiences in Africa, and this served as a kind of propaganda. Not only did the book give hope to some that they could gain the same level of recognition, it also provided more tangible support for the need to colonize Africa. The idea of ​​helping Africans to become more civilized was no longer composed exclusively of rhetoric supported by others, but never seen by the people.