Here are some quotes about being nice:

- "People think because I'm a nice person I'm a weak person. But I don't think being nice means you don't know how to take tough decisions." - Angelina Jolie
- "Being nice should never be perceived as being weak. It's not a sign of weakness, it's a sign of courtesy, manners, grace, a woman's ability to make everyone feel at home, and it should never be construed as weakness." - Ann Curry
- "Be nice to people on your way up because you'll meet them on your way down." - Wilson Mizner
- "It's nice to be important, but it's more important to be nice." - John Templeton

I hope these quotes help you. Let me know if you need anything else.