He that spareth his rod hateth his son. -- Old Testament -

Related:

• He that hath knowledge spareth his words. -- Old Testament -
  Proverbs xvii,...
• As he thinketh in his heart, so is he. -- Old Testament -
  Proverbs xxiii,...
• It is naught, it is naught, saith the buyer; but when he is gone his way,
  then he boasteth. -- Old Testament -- Proverbs xx...
• Even a fool, when he holdeth his peace, is counted wise.
  Old Testament -- Proverbs xvii,...
• Hope deferred maketh the heart sick. -- Old Testament -
  Proverbs xiii,...
• The way of transgressors is hard. -- Old Testament -
  Proverbs xiii,...
• Answer a fool according to his folly. -- Old Testament -
  Proverbs xxvi,...
• The righteous hath hope in his death. -- Old Testament -
  Proverbs xiv,...
• The eyes of a fool are in the ends of the earth. -
  Old Testament -- Proverbs xvii,...