強中自有強中手

强中自有强中手
qiángzhōngzìyǒuqiángzhōngshǒu
(idiom) however strong you are, there is always someone stronger

CEDICT

one should never be complacent because there is always room to improve one's craft

Wiktionary

（諺語）比喻智慧或技能永無止境，高手中有更高明者。《三國演義．第十七回》：「強中自有強中手，用詐還逢識詐人。」明．沈璟《義俠記．第二十二齣》：「強中自有強中手。你還不見機走，讓了快活林，殘生尚能救。」也作「強中更有強中手」。

重編國語辭典

Entry Composition

1 強 qiáng
  1. strong
  2. powerful
  3. better
  4. slightly more than
  5. vigorous
  6. violent
  7. best in their category, e.g. see 百強 bǎiqiáng
2 中 zhōng
  1. within; among; in
  2. middle; center
  3. while (doing sth); during
  4. (dialect) OK; all right
3 自有 zìyǒu
  1. (I, they etc) of course have (a plan, a way etc)
  2. one's own (apartment, brand etc)
4 強 qiáng
  1. strong
  2. powerful
  3. better
  4. slightly more than
  5. vigorous
  6. violent
  7. best in their category, e.g. see 百強 bǎiqiáng
5 中 zhōng
  1. within; among; in
  2. middle; center
  3. while (doing sth); during
  4. (dialect) OK; all right
6 手 shǒu
  1. hand
  2. (formal) to hold
  3. person engaged in certain types of work
  4. person skilled in certain types of work
  5. personal(ly)
  6. convenient
  7. classifier for skill

classifiers: 雙, 隻