不晓得人生看淡有多高只晓得爱妳爱的有多深
[bù xiăo dé rén shēng kàn dàn yŏu duō gāo zhĭ xiăo dé ài năi ài de yŏu duō shēn]
It expresses the deep and unconditional love for someone, so profound that one cannot quantify it nor cares about anything else like indifference towards life.