利己に走らず、周りの人のことも考えなさい。
Don't just look out for yourself; think about the people around you too.
社会では利己と利他のバランスが大切だ。
In society, a balance between self-interest and altruism is important.
人間の本性は利己なのか、それとも利他なのか。
Is human nature fundamentally selfish, or altruistic?