懂的不多说，说的多不懂。

Those who know don't speak much; those who speak don't know much.

Source: Tatoeba

Sentence Composition

1 懂 dǒng
  1. to understand
  2. to comprehend
=2 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂儿的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=2 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=2 的 dí really and truly
=2 的 dì (bound form) bull's-eye; target
3 不多 bùduō not many; not much
=4 说 shuì to persuade
=4 说 shuō
  1. to speak; to talk; to say
  2. to explain; to comment
  3. to scold; to tell off
  4. (bound form) theory; doctrine
=4 说 shuō variant of 说 shuō
=5 说 shuì to persuade
=5 说 shuō
  1. to speak; to talk; to say
  2. to explain; to comment
  3. to scold; to tell off
  4. (bound form) theory; doctrine
=5 说 shuō variant of 说 shuō
=6 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂儿的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=6 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=6 的 dí really and truly
=6 的 dì (bound form) bull's-eye; target
7 多 duō
  1. many; much; more; a lot of
  2. too many; in excess
  3. (after a numeral) ... odd
  4. how (to what extent) (Taiwan pr. duó)
  5. (bound form) multi-; poly-
8 不懂 bùdǒng
  1. (as a verbal complement) unable to comprehend (when seeing, hearing, etc.); cannot
  2. to not understand
  3. unable to comprehend (when seeing, hearing, etc.); cannot