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To be happy because what you already have is sufficient
Positive
直到我开始学会知足常乐，慢慢地，我才真正地提高了我的生活质量 | Zhídào wǒ kāishǐ xuéhuì zhīzúchánglè, màn man de, wǒ cái zhēnzhèng de tígāo le wǒ de shēnghuó zhìliàng
It wasn't until I learned how to be content with what I already had that my quality of life improved
[Source]
最快乐的那些人总是会知足常乐，而不会伤怀所缺的 | Zuì kuàilè de nàxiē rén zǒng shì huì zhīzúchánglè, ér bù huì shānghuái suǒ quē de
The happiest people are those who are happy with what they have in life and don't mourn what they lack
[Source]
None
知足者常乐 (zhī zú zhě cháng lè)
This is an HSK chengyu
《道德经》(Dào Dé Jīng), a sacred Daoist text written by Daoism founder 老子 (Lǎo Zǐ)
This chengyu is from a line in the work listed in the "Origin" section above