馬無夜草不肥，人無外快不富 [马无－－－－－－无－－－－]
Jyutping
maa5 mou4 je6 cou2 bat1 fei4 , jan4 mou4 ngoi6 faai3 bat1 fu3
Pinyin
mǎ wú yè cǎo bù féi , rén wú wài kuài bù fù
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a horse cannot get fat without an extra ration, a man cannot get rich without an extra income (idiom)