Hey DD, what do you mean by this? I'm reading a book about managing your energy (instead of managing your time), and am constantly looking for ways to be more efficient + get more things done.
In theory, this is how I understand it:
Time = external
Yourself = internal
Everything you do, you want to have your circle of influence be "internal," things you can control.
By managing time, you are letting an external stimulus/factor taking control of yourself versus by managing yourself, you ARE the one in control. Of course, it, perhaps, may be all semantics or it may be just an perspective. But, let's try an example.
Instead of trying to plan your days in time slots, 8am wake up, 9-12 school, 7-9pm study...etc...you should focus your energy on doing the things that are needed to be done at best you can...trying your best.
Instead of setting a time to wake up, focus you energy in getting a good night sleep and sleeping early. Instead of devoting two hours of time to studying, focus in studying hard and doing your very best. You are the one in control, you dictate the energy not time.
As a counter example, if you manage your time, what if you end up taking longer than expected or what if there is an unforeseen consequence/factor? Then, you would be in a world of hurts.
Another example of energy devotion...
Let's say you allocated exactly two hours to finish a particular session in the MCAT...7-9PM. MOST LIKELY, you will EITHER dee-dee-doo-dee-doo and finish your MCAT study goal in 2 hours with ease OR cram for time and finish your MCAT study goal in exactly two hours to meet your "time deadline." You let an external stimulus control you: Either by filling the two hours with random distractions since your goal is so easy or OR cramming to meet the deadline.
The first case, you wasted time (since you have so much time to begin with). The second case, you rushed to study which will INDIRECTLY WASTE time in the future (since you will probably forget and have to repeat the materials).
By managing yourself, you try your best at everything you do - you give it your all...once...and only once...because you know you have already tried your best. You are in control not the clock. You may take longer than 2 hours OR you may take less than 2 hours but the point is that...you will never waste a minute.
OMGWTFBBQ I typed too much. Sorry if it doesn't make sense or if it is a bunch of gibberish...
I cannot wait to graduate in March...but for now...must...do...1-2 VR passages daily + o.chem...you guys should hold me accountable for this! 
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