The Clue "Do ____ others..."
The Answer UNTO
The phrase "Do unto others" is part of a well-known saying that encourages treating people the way you want to be treated. The word "unto" fits perfectly in this phrase because it means "to" or "for" in an older style of English. This answer captures the essence of kindness and respect in our interactions with others. It's a reminder of the importance of empathy in our daily lives.