狠了心是我最不自私的自私
[hĕn le xīn shì wŏ zuì bù zì sī de zì sī]
Meaning 'being hard-hearted is my most selfish act of not being selfish', it highlights the paradoxical notion of performing a seemingly harsh action as an expression of putting another's interests above one’s own for greater good, thus justifying its necessity even if perceived as cruel.