People are emotional creatures. When you’re having a discussion, creating a piece of art or helping someone you love, be mindful of your emotional impact on your fellow human beings. As Maya Angelou said: people will forget what you said, people will forget what you did, but people will never forget how you made them feel. 

More:

How to Win Friends and Influence People (book) by Dale Carnegie.

Origin of the Maya Angelou quote (quoteinvestigator.com).