A missionary decides to venture off to Africa to spread the word to secluded tribes over in that region who might not have heard the word of god before. He settles down with a tribe he befriended.
A year goes past and things had progressed very well. One day the tribal chief pulls the missionary aside and confronts him about a white child being born to a tribes woman. The missionary explains to him that the child was nothing more than a genetic flaw. The tribesman still did not understand.
So the missionary points to the flock of sheep and points out one black sheep in the heard of white sheep and explains that it is similar to the black sheep.
Finally understanding the situation the tribal chief says "ah, i see..... well i will say nothing about the white child if you say nothing about the black sheep".