Read the excerpt from Thoughts and Sentiments. And if such men can boast of greater degrees of knowledge, than any African is entitled to, I shall let them enjoy all the advantages of it unenvied, as I fear it consists only in a greater share of infidelity, and that of a blacker kind than only skin deep. And if their complexion be not what I may suppose, it is at least the nearest in resemblance to an infernal hue. What belief is implied but not explicitly stated in this excerpt?