深海不及人心但我相信你
[shēn hăi bù jí rén xīn dàn wŏ xiāng xìn nĭ]
'Deeper than the sea but not as fathomable as human heart, yet I trust you'. It conveys a deep and perhaps complex sentiment that although human feelings can be hard to understand (like the depth of the sea), the person still chooses to place trust in someone else.