He can only wrong himself.

As I see it, I do wrong always when I consider the interests of others.

Don't you see?
How can two particles of the yeast wrong each other by striving to devour each other?
It is their inborn heritage to strive to devour, and to strive not to be devoured.

When they depart from this they sin." "Then you don't believe in altruism ?" I asked.
He received the word as if it had a familiar ring, though he pondered it thoughtfully.

"Let me see, it means something about cooperation, doesn't it ?" "Well, in a way there has come to be a sort of connection," I answered unsurprised by this time at such gaps in his vocabulary, which, like his knowledge, was the acquirement of a self-read, self-educated man, whom no one had directed in his studies, and who had thought much and talked little or not at all.