I woke from a dream of underlining (in what book? Whose words?) the best, most...

I woke from a dream of underlining (in what book? Whose words?) the best, most cogent advice about how to write that I have ever read.
In my dream, I thought: oh, now I understand how to do it. This makes so much sense to me. I will have to tell other people.
But the underlined words were gone as soon as I was fully awake, and try as I might, I could not pull them back.
I came downstairs and poured the coffee and sat in front of the computer and thought: if only I could remember what I read...