Correct
山外有山，天外有天
/ shān wài yǒu shān, tiān wài yǒu tiān /
Strokes
Definition
(idiom) however good sth is, there is always sth better/in the wider world there are people more talented than oneself
Example
Definition
beyond the mountain there's a bigger mountain; above the sky, there's always still higher sky—there's always something better; one should be always modest