水能载舟，亦能覆舟

shuǐ néng zài zhōu , yì néng fù zhōushuinengzaizhou,yinengfuzhou

1. lit. water may keep the boat afloat but may also sink it (proverb)
2. fig. the people can support a regime or overturn it
3. if sth is used properly, one can benefit from it, otherwise it can do harm
4. things can be double-edged

Study it in Yanamino