qīngchǔ shuō biānjiè，biérén gèng róngyì zhàogù nǐ，yě búyòng xiànchǎng yìzhí cāi

清楚说边界，别人更容易照顾你，也不用现场一直猜。

By clearly stating your boundaries, it is easier for others to accommodate you, and they won't have to keep guessing on the spot