天高地厚

tiāngāodìhòu
  1. (figurative) profound; deep (of kindness)
  2. complexity of things
  3. profound; deep (of kindness)
  4. the vastness of the world

Wiktionary

Entry Composition

1 天 tiān
  1. day
  2. sky
  3. heaven
2 高地 gāodì
  1. highland
  2. upland
3 厚 hòu
  1. thick
  2. deep or profound
  3. kind
  4. generous
  5. rich or strong in flavor
  6. to favor
  7. to stress

Containing this entry

不知天高地厚 bùzhītiāngāodìhòu
  1. not to know the immensity of heaven and earth
  2. an exaggerated opinion of one's own abilities