Cf: Flies are easier caught with honey than with vinegar (Br.). Honey catches more flies than vinegar (Am.). An iron anvil should have a hammer of feathers (Am., Br.). Kindness is the noblest weapon to conquer with (Am.). The rough net is not the best catcher of birds (Am., Br.). A spoonful of oil on the troubled waters goes farther than a quart of vinegar (Am.). Tart words make no friends: a spoonful of honey will catch more flies than a gallon of vinegar (Am.). There is a great force hidden in sweet command (Br.). You can catch more flies with molasses than vinegar (Am.)
Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.