ЛАСКОВОЕ СЛОВО НЕ ТРУДНО, ДА СПОРО

Cf: Civility costs nothing (Am., Br.). Courtesy costs nothing (Am., Br.). A good word for a bad one is worth much and costs little (Am.). Good words are good cheap (cost nothing and are worth much, cost nought) (Br.). Kind words are worth much and they cost little (Br.). Lip-honour costs little, yet may bring in much (Br.). Nothing costs less than civility (Am.). Politeness costs nothing and gains everything (Am.). Politeness costs nothing but gains everything (Br.)