利己

zhè dōu shì lì jǐ zhǔ yì zài zuò suì

这都是利己主义在作祟。

All this trouble is caused by selfishness.

tā mào sì kāng kǎi bù guò shì biàn xiàng de lì jǐ ér yǐ

他貌似慷慨，不过是变相的利己而已。

His supposed generosity is merely a form of self-interest.