When you run with the Doctor, it feels like it'll never end. But however hard you try you can't run forever. Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever for one moment, accepts it. Everybody knows that everybody dies. But not every day. Not today. Some days are special. Some days are so, so blessed. Some days, nobody dies at all. (In the library, the Doctor walks back to the TARDIS. He stops, looking at the doors. Then he raises his hand, and stands there poised like that for a long moment. Finally he snaps his fingers. The doors open. He smiles slowly and walks in, joining Donna. Then he snaps his fingers again, and the doors close. River's voice continues over this.) Now and then, every once in a very long while, every day in a million days, when the wind stands fair, and the Doctor comes to call... everybody lives.
The biggest wall you have to climb is the one you build in your mind: Never let your mind talk you out of your dreams, trick you into giving up. Never let your mind become the greatest obstacle to success. To get your mind on the right track, the rest will follow.
Sometimes all a person wants is an empathetic ear; all he or she needs is to talk it out. Just offering a listening ear and an understanding heart for his or her suffering can be a big comfort.