What's the best piece of advice you've ever been given, and who gave it to you?

The "I'm always right" theory, from my husband Don, is very valuable to me. It's a confidence boosting way to proceed with decisions that allows for new information and changing opinions, no matter who you are. It's about what one believes to be correct at the time of question. It doesn't mean I don't make mistakes, it just means that I base my statements on what I know. As I know more, I may change my answers, but I always believe them to be right.

What's on your mind? Fun or serious questions welcome.