Our delight in any particular study, art, or science rises and improves in proportion to the application which we bestow upon it. Thus, what was at first an exercise becomes at length an entertainment.
For the high achievers, studying gave them the pleasing, absorbing challenge o flow 40 percent of the hours they spent at it. But for low achievers, studying produced flow only 16 percent of the time; more often that not, it yielded anxiety, with the demands outreaching their abilities
Too much attention to health is a hindrance to learning, to invention, and to studies of any kind, for we are always feeling suspicious shootings and swimmings in our heads, and we are prone to blame studies from them.