Tesla must have been a very interesting person in many ways, he made many basic discoveries in electrical phenomenon and conducted many interesting experiments.
Some of Tesla’s experiments and thoughts can be found at this site.

http://www.tfcbooks.com/tesla/energy.htm

Some of his ideas seem ‘way out’ of the ordinary; for instance, I did not understand his idea of “increasing human energy” until I read his explanation and took some time to think about it.
Tesla understood that energy and frequency are related, he also understood that motion and energy are related. The slower an object moves the less energy it contains, also the higher the frequency of oscillation the higher the energy content.
So if I drink several bottles of beer one after another, my reaction time and motions will slow down, (although the ‘frequency’ of my visits to the bath room will increase) “slow human energy” then would be ‘slower motion and reaction time or any other detrimental human behavior'. Higher human energy would be any behavior that is beneficial to the human race.
Hmm….slower reaction & motion combined with higher frequency of…..could it be that Tesla did not consider the possibility of a ‘constant’ buried in the equations somewhere?
;-)