Meaning of the word "politeness costs little but yields much" in English

What does "politeness costs little but yields much" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

politeness costs little but yields much

US /pəˈlaɪtnəs kɔːsts ˈlɪtəl bʌt jiːldz mʌtʃ/
UK /pəˈlaɪtnəs kɒsts ˈlɪtəl bʌt jiːldz mʌtʃ/
"politeness costs little but yields much" picture

Idiom

being polite is easy and inexpensive to do, but it can bring great benefits or rewards

Example:
Remember that politeness costs little but yields much when dealing with difficult customers.
He always says that politeness costs little but yields much in building strong relationships.