Comment by lqet

For me, there is a difference between working "hard" and working "deep". Working "hard" means being busy, typically more than 8 hours a day. Example: answering mails, writing some sort of report, dealing with customers, driving a truck, sitting at a cash register all day. Working "deep" means being extremely focused on a challenging thing until it is done. This can be writing code, but also theoretical writing or building something with your hands, even repairing something. After a "hard" day, I am completely exhausted and my mind is blank. After a "deep" day, I am satisfied and euphoric.