Also consider the frustratingly common practice of forwarding an e-mail to one or more colleagues, labeled with a short open-ended interrogative, suc… - Cal Newport

When you skip a meal, telling your rumbling stomach that food is coming later in the day, and therefore it has no reason to fear starvation, doesn’t alleviate the powerful sensation of hunger. Similarly, explaining to your brain that the neglected interactions in your overfilled inbox have little to do with your survival doesn’t seem to prevent a corresponding sense of background anxiety. To your entrenched social circuitry, evolved over millennia of food shortages mitigated through strategic alliances, these unanswered messages become the psychological equivalent of ignoring a tribe member who might later prove key to surviving the next drought. From this perspective, the crowded email inbox is not just frustrating — it’s a matter of life or death.

Simply put, humans are not wired to be constantly wired.

the deep work novice. As I established in the opening to this rule, the ability to rapidly switch your mind from shallow to deep mode doesn’t come naturally. Without practice, such switches can seriously deplete your finite willpower reserves. This habit also requires a sense of confidence in your abilities — a conviction that what you’re doing is important and will succeed. This type of conviction is typically built on a foundation of existing professional accomplishment.