Just to clarify:
- The cracks in time are the Time Lords trying to get back into the universe.
- Madame Kovarian’s sect of the Papal Mainframe blew up the TARDIS to prevent him from reaching Trenzalore.
- Silence Will Fall is the promise made by the non-Kovarian sect to not let the Doctor speak his name.
- The Silents are the priests of the Papal Mainframe, and are genetically designed to make confessors forget once they’ve confessed.