柠檬不该羡慕樱桃的红樱桃不该羡慕柠檬的绿
[níng méng bù gāi xiàn mù yīng táo de hóng yīng táo bù gāi xiàn mù níng méng de lǜ]
Lemons should not envy the redness of cherries and cherries should not desire the green of lemons. It emphasizes appreciating one's uniqueness without desiring to be what they are not.