Motivation is a funny thing. No matter how bad you want something for someone else, you can make them want it. You can force them into doing things that might get them closer to what you have in mind but if it isn't their goal, you can never get them there. What if they have great talent that they are wasting, you might ask. What if they can't see the future and how today's choices are affecting it? What if they can't see what you can see? None of that matters because until they do see, until they do want, until it becomes about them...there is absolutely nothing you can do.
Does that mean you quit trying? I don't think so. Does it mean you care less or push less? I don't think so. Does that mean you give up on trying to get someone to realize their full potential? I don't think so. Does it mean at times you will be frustrated? I think so. Does it mean at times you will be angry? I think so. Does it mean you might argue? I think so. Does it mean you stop caring? Never.
Just realize my motivation is not your motivation and your motivation may not be mine. Just realize my dreams are not your dreams and your dreams are not my dreams. Just realize I love you no matter what and you love me no matter what. In the end, we will all have regrets but not because we didn't try and not because we didn't try hard enough. But let's make sure our regrets are our own. Live your own life not through someone else's life.