自此别过不相逢谁又知南风
[zì cĭ bié guò bù xiāng féng shéi yòu zhī nán fēng]
Means 'Since we part, we may never meet again, who knows about the south wind.' This indicates a deep sigh over an irretrievable farewell. The 'south wind' is used metaphorically to express intangible sentiments that are left after a departure.