西瓜不该羡慕柠檬的酸柠檬不该嫉妒西瓜的甜
[xī guā bù gāi xiàn mù níng méng de suān níng méng bù gāi jí dù xī guā de tián]
A poetic way to suggest that everyone should appreciate their own uniqueness and strengths instead of envying others. 'Watermelon shouldn't envy the sourness of lemon, lemon shouldn't envy the sweetness of watermelon'.