心事终难说破
[xīn shì zhōng nán shuō pò]
Difficult things are hard to put into words; 'Xin Shi Zhong Nan Shuo Po' conveys a sentiment where feelings are too complex or painful to express openly. It implies secrets held deeply within one's heart, often about matters very personal, possibly even love stories unspoken for fear they would not be reciprocated.