Re: 7X13 The Name Of The Doctor(Grading/Discussion)(SPOILERS!)
The phrase "silence will fall" could refer to the Doctor's victories turning into death. "The Stars are going out". Which we saw in TNOTD, no stars could = no life hence silence.
On the continent of wild endeavour in the mountains of solace and solitude there stood the citadel of the time lords, the oldest and most mighty race in the universe looking down on the galaxies below sworn never to interfere only to watch.