Do you think you have made a positive impact on people's lives?

What do you think is the biggest positive impact you've had on someone's life? How have you made a positive impact on someone's life lately? Who is someone that had a positive impact in your life that probably doesn’t realize how they impacted you? How are you making a positive impact in other peoples’ lives? What positive changes have you made in your life that you’d like to show off a bit? What’s that effort you’ve been putting in? What is the greatest positive change you have ever witnessed in another person?
I'd like to get your perspective on a positive change you've witnessed in someone else - what that person was like before, what did he accomplish, his struggle, if any, and how did that change impress or affect you. I'm hoping for some amazing feel-good stories. What has someone done for you that made a big impact on your life, that that person probably never knew the significance of?