Answer:
The author reveal that Wilse feels in his heart that slavery is wrong, even though he defends it as an economic necessity, by showing that the question makes Wilse unable to continue eating, and he admitted that he has no justification to offer to his maker for being master over another man.
Step-by-step explanation:
Wilse Graham tries to dodge answering Ellen's question, and that in itself is proof that he has conflicting emotions about the topic.
When John pressed him about it his reaction of his food after Ellen asked the question, and the answer he finally gives reveals that he feels slavery is wrong even though it is important to the economy.
The author made the revelation with these lines:
'Wilse hesitated a moment, his eyes on the plate of food, which he had barely touched during the last few minutes. "I'll say this to you, Cousin John," he said finally. "I own a few slaves, and if I stood before my Maker alongside one of em, I'd hev no way to justify the fact that I was master and he was slave.'