However others judge me, it's as a passing cloud to me.
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From 《论语·述而》: 饭疏食，饮水，曲肱而枕之，乐亦在其中矣。不义而富且贵，于我如浮云。 — 'Eating coarse food, drinking water, using a bent arm for a pillow — there is joy in this too. Wealth and rank gained by unrighteousness, to me, are like floating clouds.' A canonical Confucian expression of principled indifference to ill-gotten gain.
usage
于 here is a classical preposition (= 对). Modern internet-speak also adapted the phrase playfully (e.g. 一切都是浮云 — 'it's all just clouds'), but the classical original is pointedly about unrighteous wealth.
