知无不言，言无不尽
zhī​wú​bù​yán​yán​wú​bù​jìn

to speak without reservation

  1. 知无不言 知無不言 zhī​wú​bù​yán
    to say all one knows
    to hold nothing back; to tell everything one knows without reservation
  2. ， yán
    non-Chinese
  3. 言无不尽 言無不盡 yán​wú​bù​jìn
    to speak without reserve
    To say everything that is on one's mind; to express one's views or opinions without holding anything back.