深知人心却从不与世无争深得我心却从不让我靠近
[shēn zhī rén xīn què cóng bù yŭ shì wú zhēng shēn dé wŏ xīn què cóng bù ràng wŏ kào jìn]
This reflects the sentiment of understanding human nature thoroughly without becoming involved in competition or conflict. Simultaneously, it implies someone has captured your heart completely yet keeps a respectful distance from forming deeper connections.