I'm not giving any commencement addresses this year, although I have given a few in the past.  If I were to give one this year, I think I'd say something like this.

"In our school's World History book, there are about 300 people named in the index.  Only 300 people are mentioned in a book that claims to- tell the entire history of the world!  Now I know there are others who have changed the world forever, at least within their own disciplines, who don't get into the history books:  the Beatles, e.e. cummings, Billy Graham.  So I'll be generous and multiply the number of world changers in our history books by 10.  Let's say there's been 3000 people who have actually changed the world. 

"Now, there's almost 7,000,000,000 people in the world today.  Let's say that's 50% of all the people who have ever lived, which is a conservative estimate.  That's 14,000,000,000 people in the history of the world.  That means  approximately .00000025 of all the people who have ever lived have actually change the world.  Using this data, I'd be a fool to tell you to strive to change the world.  God doesn't seem concerned with making everyone a world changer.

"Instead, I encourage you to change tires for the young mom whose mini van is broken down on the side of the highway, as she tries to keep her three kids from the danger of oncoming traffic.  Change the oil for your elderly neighbors every couple of months.  Change diapers for the single mom next door, or, young men, the diapers of your own kids.  Change your spending habits and spend less on yourself and give more to subsaharan Africa, or your local church's benevolence fund.  Change your attitude toward the poor, the immigrant, and the elderly.  Change the clothes of a quadriplegic who can't dress himself.  Change your calendars so that you spend more free time with your families, or the sick, or the imprisoned, and less time on the golf course or ski slopes.  These are changes you can all do, and must do, if the world is going to change at all."