Physicians are Physicians. Friends are Friends. Rest is Clutter. - William Zinsser

In visual reading, like verbal reading, the completeness of the reading relates directly to the quality of the reader’s stored information.

I mention this to give confidence to all non-fiction writers: a point of craft. If you master the tools of the trade — the fundamentals of interviewing and of orderly construction — and if you bring to the assignment your general intelligence and your humanity, you can write about any subject. That's your ticket to an interesting life.

An idea can have value in itself, but its usefulness diminishes to the extent that you can’t articulate it to someone else.