Mr.Brown’s march precept is ,Kind words do not cost much,yet they accomplish much.-by Blaise Pascel. Means that to say nice things such as thank you don’t cost much like you don’t have to pay any thing to say them you can just say them without any constraint  on you.

Here is an example when someone says something nice to you say something nice to them  kind words are not measured in expense they are measured in kindness. It’s the same with saying bad stuff it is measured in how bad the word is.