能解释的从来都不是爱情
[néng jiĕ shì de cóng lái dōu bù shì ài qíng]
In English it would translate into 'Anything explainable has never been love.' Here it suggests the complexity or inexplicability of true love - if it can be explained rationally, perhaps it is not really love, as this emotion involves profound feelings beyond plain comprehension.