You get another person who operates only in an African language and there are many persons who operate only in African languages; he or she is excluded from all the goodies that come with English. And even in terms of justice, law codes, the legal system. A person who does not know English in Africa is excluded from that system because he can only operate through acts of translation.
In philosophy equally as in poetry it is the highest and most useful prerogative of genius to produce the strongest impressions of novelty, while it rescues admitted truths from the neglect caused by the very circumstance of their universal admission.