An issue of National Geographic included a photograph of the fossil remains of two saber-tooth cats locked in combat. To quote the article: "One had bitten deep into the leg bone of the other, a thrust that trapped both in a common fate. The cause of the death of the two cats is as clear as the causes of the extinction of their species are obvious. When Christians fight each other, everybody loses. As Paul put it, "if you keep biting and devouring each other, watch out or you will be destroyed by each other."