Have you ever made a 'mark' on somebody elses life?? How? Why??

I was lying down when I thought of the idea does everybody have that innate thing on themselves to have 'marked' somebody elses life with something they have done out of helping or you just wanted to give away things or encourage somebody on something. I have seen my parents help out friends not because they need to but they want to. And so I grew up with a heart of helping friends out whether it was financial concerns or not. I do not want anything return but to see them better, happy and enjoying the life that they should be. How about you..What did you do that made you 'mark' something on somebody elses life and why did you do it. Is it out of the goodness of your heart or you were forced to do it.