瑜伽論記 19.187

19.187

於諸欲中行正行者，謂如商主行於商路於諸賄貨者，菩薩於五欲境守護諸行，如諸商侶過儉護財。

Where it says 'practicing correct practice among desires', it means: just as a merchant leader traveling on a trade route guards all wealth and goods, the bodhisattva guards all practices amid the objects of the five desires, just as traveling merchants passing through scarcity guard their wealth.