知易行難

知易行难
zhīyìxíngnán
  1. easy to grasp but difficult to put into practice (idiom)
  2. easier said than done

CEDICT

了解事物的道理很容易，做起來卻很難。

重編國語辭典

了解事物的道理容易，做起來卻很難

維基詞典

Entry Composition

1 知 zhī
  1. to know
  2. to be aware
2 易行 yìxíng easy to carry out
3 難 nán
  1. difficult (to...)
  2. problem
  3. difficulty
  4. difficult
  5. not good

Related entries

談何容易 tánhéróngyì easier said than done (idiom)