I listened to the Librivox audio reading of this book - till the site was shut down for maintenance, upon which I read ch 5 online.
I really don't buy the idea of relentlessly pushing yourself when you're already burned out and near the breaking point (no Pomodoro back then), and sleeping only 4 hours a night, but other points that Hilton makes are very solid, e.g. we fritter away much energy needlessly simply because we haven't decided on what course we're going to take. Decide early, focus on your clearly-definied objective singlemindedly, have only thoughts that "harmonize" with your goal, do not allow yourself to be sidetracked by any distractions whatsoever (hear that, Facebook fans?), get rid of superfluous actions like fidgeting and scratching. You should maintain "a stoical indifference to petty physical disorders and social vexations." (I like the phrase "social vexations" - in fact a lot of energy does indeed tend to get needlessly eaten up by these. ) And "You must work when you work, and you may play when you play, but your business must be the most fascinating of games and the only one you play during business hours." Overall not bad as an inspirational pep talk and worth a listen.