- Дурак кричит, умный молчит
- See Глупый болтает, а умный думает (Г)
Cf: Full vessels give the least sound (Br.). Не who knows does not speak; he who speaks does not know (Am.). Knowledge talks lowly; ignorance talks loudly (Am.). People who know little talk much; people who know much talk little (Am.). A wise head makes a close mouth (Br.). The wise man keeps his own counsel (Am., Br.). Wise men have their mouths in their heart, fools their heart in their mouth (Br.). Wise men silent, fools talk (Br.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.