The one thing Cole wants to hear most in the world: I'm proud of you.
The writers not only gave us an absolutely heart breaking scene that makes tears slither down my face. They also managed to tie it into his True Potential Arc all the way back in Season 1.
Cole's greatest fear is disappointing the people he cares about, especially his parents. So Lilly tells him (maybe one of the very last things she says) that she is proud of him and that's what he needed more than anything else.


















