言聽計從

言听计从
yántīngjìcóng
  1. to see, hear and obey (idiom); to take advice
  2. to take sb at his word

CEDICT

to always follow somebody's advice; to act upon whatever somebody says; to have implicit faith in somebody

Wiktionary

形容深被信任。《三國演義．第八○回》：「臣自出茅廬，得遇大王，相隨至今，言聽計從。」《官場現形記．第一一回》：「他在劉中丞手下當差，卻也非止一日，一向是言聽計從，院上這些老爺們，沒有一個蓋過他的，真正是天字第一號的紅人。」也作「言聽計行」。

重編國語辭典

指聽從某人說的話語、出的計謀，形容某人深受信任

維基詞典

Entry Composition

1 言 yán
  1. words
  2. speech
  3. to say
  4. to talk
2 聽 tīng
  1. to listen to; to hear
  2. to heed; to obey
  3. a can (loanword from English "tin")
  4. classifier for canned beverages
  5. to let be; to allow (Taiwan pr. tìng)
  6. (literary) to administer; to deal with (Taiwan pr. tìng)
3 計 jì
  1. to calculate
  2. to compute
  3. to count
  4. to regard as important
  5. to plan
  6. ruse
  7. meter
  8. gauge
4 從 cóng
  1. from; through; via
  2. (bound form) to follow
  3. (bound form) to obey
  4. (bound form) to engage in (an activity)
  5. (used before a negative) ever
  6. (bound form) (Taiwan pr. zòng) retainer; attendant
  7. (bound form) (Taiwan pr. zòng) assistant; auxiliary; subordinate
  8. (bound form) (Taiwan pr. zòng) related by common paternal grandfather or earlier ancestor