I felt my cheeks grow red with sudden anger. It was impossible to make him understand that one might be outraged by his callous selfishness. I longed to pierce his armour of complete indifference. I knew also that in the end there was truth in what he said. Unconsciously, perhaps, we treasure the power we have over people by their regard for our opinion of them, and we hate those upon whom we have no such influence. I suppose it is the bitterest wound to human pride. But I would not let him see that I was put out.

"Is it possible for any man to disregard others entirely?" I said, though more to myself than to him. "You're dependent on others for everything in existence. It's a preposterous attempt to try to live only for yourself and by yourself. Sooner or later you'll be ill and tired and old, and then you'll crawl back into the herd. Won't you be ashamed when you feel in your heart the desire for comfort and sympathy? You're trying an impossible thing. Sooner or later the human being in you will yearn for the common bonds of humanity."

请教老师：

没看懂 by their regard for our opinion of them - 不会分析语法和成分？

另外，the human being in you will...这里的being可有可无吧？