過多會壞事，過少不濟事。

Too much spoils, too little is nothing.

Source: Tatoeba

Sentence Composition

1 過多 guòduō too many; excessive
=2 會 huì
  1. can; to have the skill; to know how to
  2. to be likely to; to be sure to
  3. to meet; to get together
  4. meeting; gathering
  5. (suffix) union; group; association
  6. (bound form) a moment (Taiwan pr. huǐ)
=2 會 kuài (bound form) to reckon accounts
=2 會 kuò only used in 會撮／会撮
3 壞事 huàishì
  1. bad thing; misdeed
  2. to ruin things
4 過少 guòshǎo
  1. too few
  2. insufficient
5 不濟 bùjì (coll.) no good; of no use
=6 事 shì
  1. matter
  2. thing
  3. item
  4. work
  5. affair

classifiers: 件, 樁, 回
=6 事 zì
  1. alternative form of 倳 (zì, “to establish”)
  2. alternative form of 剚 (zì, “to stab”)