가는 말이 고와야 오는 말이 곱다
going word be-charming-IF coming word be-charming
If outgoing words are charming then incoming words are charming.
Speak well and kindly to others, and they will return the favor. This is the Golden Rule, applied to words, anyway. It’s also the converse of the famous dictum “garbage in, garbage out.”
I certainly think this true. It’s not always easy to keep to it, in practice, but I’m always and forever trying.