知你如心爱你如己
[zhī nĭ rú xīn ài nĭ rú jĭ]
Knowing you as profoundly as my own heart would know me; loving you as dearly as I would love myself portrays immense understanding, empathy, and dedication in a relationship that has reached the depth where one individual's soul mirrors another’s, with a love so pure and strong as the care for oneself.