This is a micro book review, kicked off by a tweet:

You suggested books:

A quick review

There are many manifestations of mental effort: paying attention to a speaker, noticing the patterns on the wings of a particular butterfly, planning a route to a dinner date, finding the words to tell someone you're breaking up with them, puzzling out how to install a bathroom light fixture into a space that is half an inch too small. In its different forms, mental effort is called called attention, deliberation, planning, observation, comprehension. I won't try to present a unified theory of the mechanisms behind these. For now, I’ll simply group them under the label of “focus”.

Focus requires effort. During focus, a brain consumes oxygen, burns calories, and generates chemoelectric activity. We have a limited amount of focus energy. Extended periods of focus result in fatigue. We can increase this capacity over time through practice, but it is always limited.

Focus is active. It is listening rather than merely hearing. Watching rather than seeing. Deliberating rather than reacting. Passive mental activity I'll call "instinct". Focus and instinct are mutually exclusive. We can be in one mode or the other, but not both at the same time.

The reading list above is all about focus and instinct:

If you only read one book on this list, read Make Time. It is profound but not preachy. Every book on this list had great stories and great suggestions, but this one had the most immediately useful collection, most accessibly presented. ( Thanks Caitlin Hudon for the recommendation!)

If you read just one other, read Peace is Every Step. It's far more practical than it sounds. This was my first exposure to this concept of focus, which it calls Mindfulness. I've adopted a handful of everyday mindfulness practices from it that have changed me in ways too deep to plumb.