Later on, after discussing her diary, River asked, “Doctor, is there a reason why you’re not looking at me? Oh! You’re angry. Which usually means you’re feeling guilty. How have you let me down lately?”

The Doctor suddenly recalled again the death of River from Forest of the Dead just as the clerics began to materialise. ”Whatever it is,” continued River, “I’m sure I’ll forgive you. Long as you forgive me.”

- from The Time of Angels original script (The Doctor Who Companion: The Eleventh Doctor Vol. 1)