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With this new singleness of purpose, he eliminated everything else from his life. He called the process “reducing himself to zero.”
Greg Mckeown • Essentialism: The Disciplined Pursuit of Less
Our belief was that if we kept putting great products in front of customers, they would continue to open their wallets. —Steve Jobs, cofounder and CEO of Apple
Alan Lewis • Edge Strategy: A New Mindset for Profitable Growth

Essentialism is not about how to get more things done; it’s about how to get the right things done. It doesn’t mean just doing less for the sake of less either. It is about making the wisest possible investment of your time and energy in order to operate at our highest point of contribution by doing only what is essential.
Greg Mckeown • Essentialism: The Disciplined Pursuit of Less
The English translation is: Less but better. A more fitting definition of Essentialism would be hard to come by.
Greg Mckeown • Essentialism: The Disciplined Pursuit of Less

Focus on one target market or persona at a time.
Marty Cagan • INSPIRED: How to Create Tech Products Customers Love (Silicon Valley Product Group)
The top goal framework will help you fix this. Greg McKeown, who wrote a phenomenal book on productivity called Essentialism: The Disciplined Pursuit of Less, boils this down to one key concept: Schedule two hours each day (i.e., put an event in your calendar) to work on your top goal only. And do this every single workday. Period.