I've been wanting to contribute to this thread for awhile!
When I was growing up, my mama taught us two of her favorite sayings:
"Service to others is the rent you pay for the space you occupy on Earth." Albert Schweizer (you'll find something similar attributed to Mohammed Ali, but she has this written in her prayer journal in 1953)
Politeness is to do and say
The Kindest thing in the kindest way.
Thanks, Mama!