強中自有強中手 [强－－－强－－]

Jyutping koeng4 zung1 zi6 jau5 koeng4 zung1 sau2
Pinyin qiáng zhōng zì yǒu qiáng zhōng shǒu

Definitions (CC-CEDICT)
  1. (idiom) however strong you are, there is always someone stronger
Definitions (粵典–words.hk)
  1. 語句
    一個​人​再​強大​，​都​總會​有​一個​強大​過​佢​嘅​對​手​；​意思​係​指技藝​無​止境​，​唔​能夠​自滿​自大
    "Don't be arrogant."; literally: However strong you are, there is always someone stronger.
  2. 近義詞
    一山還有一山高
Definitions (Wiktionary)
  1. proverb
    one should never be complacent because there is always room to improve one's craft