" The ability to concentrate intensely is a skill that must be trained. This idea might sound obvious once it’s pointed out, but it represents a departure from how most people understand such matters. In my experience, it’s common to treat undistracted concentration as a habit like flossing—something that you know how to do and know is good for you, but that you’ve been neglecting due to a lack of motivation. This mind-set is appealing because it implies you can transform your working life from distracted to focused overnight if you can simply muster enough motivation. "

― Cal Newport , Deep Work: Rules for Focused Success in a Distracted World