I was fortunate to be reading this along [b:Rapt Attention and the Focused Life|6262510|Rapt  Attention and the Focused Life|Winifred Gallagher|https://d.gr-assets.com/books/1408920525s/6262510.jpg|6445747]; Sontag's journal is an excellent example of how focus works. Sontag was - or seemed - very effective in directing her attention and _organising her interests into projects and areas for further study_. (She also suffered from severe case of tunnel vision romantically, or so she comes accross). I believe the standard response to this volume is to wish to write more - notes, lists, projects.