Happy to find As Consciousness Is Harnessed to Flesh: Journals & Notebooks 1964-1980 by Susan Sontag in today's mail. It's the 2nd of 3 volumes, and I've been awaiting it with anticipation. Here's a taste from 1964 (I was 11 then):
"Writing is a little door. Some fantasies, like big pieces of furniture, won't come through."