The way that you naturally think and communicate will help your friend find the right path into their future. They'll come to you for advice and they'll want to hear your perspective on things, because to them, you'll be a kind of guide -- a sherpa that will accompany them up the mountain path of their life! Even when neither of you thinks that you're discussing anything of great importance, your buddy will still get a lot out of hearing you tell your point of view.
It might be as simple and profound as you setting a great example for them, for what kind of person they want to be. Your kindness, your intelligence, your thoughtfulness will all be inspiring to them, and they'll want to emulate your good qualities. Most likely, you'll have a big impression on this person, even if theirs on you isn't quite as profound.