Has a Friend's Advice Changed Your Life?

In the August 2012 edition of Real Simple, the editor's note starts out with:

"Have you ever had a conversation that changed your life? Maybe you didn't notice it in the moment, or even the following day. But later you realized that that one exchange fundamentally altered who you are and how you look at yourself or the world."

Editor Kristin Van Ogtrop challenged Real Simple readers to: "thank the person who gave you a bit of enlightenment."

I'm all for that! But let's take this and apply it to friendship. Friends (especially those that are opposite from us in certain ways) have the ability to change our life and broaden our view of the world. Has a friend done that for you?