The time and energy given to us are limited.
If you try to spread it too wide, your efforts will become as thin as paper.
People expect their accomplishments to pile up as they work, but that requires subtraction, not addition.
If you want to get more results, you need to reduce the number of things you do.
Trying to do too much at once, even if it's effective, will only lead to negative results as you keep adding work without reducing anything.
We often miss deadlines, experience unsatisfactory results, feel more stressed, work longer hours, sleep less, eat poorly, exercise less, and spend less time with family and friends.
This is because we have wasted our efforts in pursuing things that were easier to obtain than we thought.
Digging in is a simple way to achieve extraordinary results.
Plus, it's effective.
It works anytime, anywhere, in any case.
Why? Because it gives you a single sense of purpose, a single goal: ultimately, to reach your desired destination.

--- p.19~20, from “Chapter 1, What is the ‘one thing’ that is most important to you?”

Because great success doesn't happen all at once, it happens sequentially.
What starts out linear becomes exponential.
Make the right decision, and then make another right decision.
As time goes by and these accumulate, the potential for success bursts forth like a flood.
The domino effect applies to big-picture tasks like your job or business, and it also applies to the tiny moments in your day when you make decisions like what to do next.
Success builds on success, and when this happens repeatedly, you can move towards the highest levels of success.

--- p.26, from “Chapter 2, The Domino Effect”

So he and his fellow researchers gave questionnaires to 262 students to find out how often they multitasked.
Then, they divided the students into two groups: those who were good at multitasking (i.e., did it often) and those who were bad at it, and began an experiment based on the assumption that those who multitasked often would perform better.
But their thinking turned out to be wrong.
“I thought they had some kind of secret power.
However, it has been observed that people who are good at multitasking end up wasting time on unrelated tasks,” says Nas.
Their performance was inferior in every way.
To themselves and the world, they seemed to be very good at multitasking, but there was one problem.
In Nas's words, "multitaskers were just terrible at everything."
Multitasking is an illusion.

--- p.58~59, Chapter 5, Multitasking is a skill)

I want to tell you the story of a man named Scott Forstall.
He told applicants at a recruiting event for his new team that if they took on this top-secret project, they would “make a lot of mistakes and struggle, but ultimately, there would be endless opportunities to do something they would remember for the rest of their lives.”
He spread this cryptic message to talent across the company, and only recruited those who immediately took on the challenge.
As he later told her after reading Dweck's book, he was looking for people with a "growth mindset."
Why is this story important? Even if you've never heard of Scott Forstall, you can't help but recognize the results of the teams he assembled.
Forstall was a senior vice president at Apple, and the team he chose to create was the iPhone.

--- p.124, from “Chapter 9, Big Things Are Dangerous”

Connect 'today' to 'all the tomorrows' you have.
There are also research results that support this.
A total of 262 students were studied to see how visualization affected the results.
Students were divided into two groups. One group visualized a desired outcome (e.g., getting an A on a test), while the other group visualized the steps needed to achieve that outcome (e.g., the study process needed to get an A on a test).
In conclusion, students who visualized the process achieved better results overall.
Students who started studying earlier and studied more frequently achieved higher grades than those who only visualized the results.

--- p.193~194, from “Chapter 14, Live by Priorities”