西瓜不该羡慕柠檬是酸的柠檬不该羡慕西瓜是甜的
[xī guā bù gāi xiàn mù níng méng shì suān de níng méng bù gāi xiàn mù xī guā shì tián de]
An encouragement to appreciate oneself rather than comparing with others. This idiom implies that both the watermelon and lemon should embrace their own uniqueness instead of envying what the other has, suggesting acceptance of one’s qualities without resentment towards the advantages enjoyed by someone else.