I like this, but instead of saying they don't deserve to be there, I would add that having made it into Stanford is actually "nothing". It could be like this:

I like this, but instead of saying they don't deserve to be there, I would add that having made it into Stanford is actually "nothing". It could be like this: Stanford will probably be the most intensive and formative period in your life. However, Stanford can only prepare for the big things that are about to come. The real test comes, once you have your degree in their hands. What will you do with you life after Stanford, will they want to be a pure engineer, work at Facebook or Google, will you try to found the next billion dollar startup, will you cure cancer or become an astronaout? Stanford might seem big and overwhelming now, however it is still just a nursery and a stepping stone to the challenges to come after Stanford. So don't be overwhelmed, stay humble, stay foolish.