While you may or may have not ever met your great grandfather, the feeling still stands. He has seen you grow up into an amazing person and he just wishes he could tell you how proud he is of you.
I'm Proud Of You
Your great grandfather may have never been in your life or at least for very long but your great grandfather wants to tell you how much he loves you. You're his great grandchild and you mean the absolute world to him.
I Love You
While you may have felt like the world is against you, your great grandfather has always believed in you. Even if he's not of this earth anymore, he will always stand by your side and believe that you'll do great.
I Believe In You
It's easy to beat yourself up when you make a mistake but your great grandfather wants to let you know not to worry about it. He believes in you greatly and knows you're no less of a human because of your mistakes.
I Won't Think Less Of You For Your Mistakes
You have a beautiful soul and while you may not be able to see it, your great grandfather surely can. He has no trouble looking beyond everything else and seeing the beauty in you.