In the spring of 2009, I had the honor of being asked to give the graduation speech at the Beijing World Youth Academy, where I taught physics from 2007 to 2009. It is (or was at the time) their tradition to ask one of the departing teachers to be the main speaker at the ceremony. They probably asked other people first, but no one else was willing, as we were all busy with our end-of-the-year insanity. And so they turned to me.
With my characteristic modesty, I declare that I did a pretty good job coming up with a simple and inspiring message. Here it is: