A quiet room gives an ordinary thought enough space to finish.

Most thinking is not dramatic. It is a half-formed practical thought that needs about ninety uninterrupted seconds to reach its own conclusion, and noise keeps knocking it over before it gets there. The result is a day spent starting the same thought repeatedly and never hearing the end of it. Quiet is not a luxury in that sense; it is the condition for finishing.

Find fifteen minutes somewhere without input this week, including the input you enjoy. Do not aim to think about anything in particular. Let the unfinished ones come back and see which completes itself.