However strong you are, there's always someone stronger.; For every able person there is always one still abler.

强中自有强中手，能人背后有能人。

《新英汉大辞典》

However strong you are, there's always someone stronger.; For every able person there is always one still abler.

强中自有强中手，能人背后有能人。

《新英汉大辞典》