白天不懂夜的黑咖啡不解酒的醉
[bái tiān bù dŏng yè de hēi kā fēi bù jiĕ jiŭ de zuì]
'Daytime cannot understand the blackness of night; Coffee cannot sober up a drunk man'. Here the netizen uses two contrasts, implying that some experiences can only be truly understood after going through them.